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TL;DR: She do work, just not as much as before.

The effectiveness of this build was severely diminished as of 03/05/2020 (Warframe Revised: Update 27.2.0) and remains severely impacted as of 03/28/2020 (Operation: Scarlet Spear: Hotfix 27.3.5).

With Patches 27.2.0 and 27.3.5:

• This weapon received a BUFF of a 20% increase in AOE radius size (on projectile explosion and reload explosion). This would have significantly increased the potential damage and suppressive capabilities of the weapon.

• This weapon received a NERF of a 60% radial damage fall-off on AOE explosion (previously non-existent). This means that within the radial size of the AOE explosion, the outer edge will only deliver 40% of your total damage with 100% occurring in the epicenter of the explosion. This significantly reduced the AOE damage potential and suppressive capabilities of the weapon.

• This weapon received a NERF of self-damage on AOE explosion (previously non-existent) that results in stagger. While a special consideration was made for the Shedu based on the size of its AOE explosions, this weapon has become incredibly difficult to use in almost all short-range encounters without chain-staggering its user. The application of stagger recovery mods to your warframe does not provide an adequate workaround for this fatal flaw and the introduction of stagger prevention mods to the weapon itself would result in too significant a loss in damage. Additionally, restricting users to overcome this flaw through other means, such as [Trinity]'s Link or Atlas's Passive are considered to be unacceptable as it removes build variety. If you are fighting something in close-range, you'll be using melee.

• With the addition of damage fall-off for AOE splash damage, highly mobile enemy units, such as sentients and other flying units, are significantly more difficult to eliminate without the use of [Terminal Velocity]. Previously, the weapon was more forgiving as if you missed a flying target, hitting a nearby object (wall, ceiling, floor, etc.) would trigger the AOE projectile's splash damage as if you hit the target itself. If you are fighting highly mobile units, take care to lead and aim carefully.

• Elemental effects were re-worked:
  -- HEAT: No change to effect, on effect proc deals 350% of base HEAT damage over 6 seconds, causes a panic effect for 4 seconds, and strips up to 50% of the target's armor.
  -- VIRAL: On effect proc, attacks against the target deal an increased 100% damage with subsequent effect procs adding an additional 25%, up to 325% additional damage (Previously on effect proc, the target's health pool would be halved and additional procs would reset effect duration).
  -- RADIATION: On effect proc, the target will deal an increased 100% damage to allies with subsequent effect procs adding an additional 50%, up to 550% additional damage, and will be attacked by allies during the effect.

• The weapon retains a utility advantage: unlimited ammo, ability to use while holding objects (data masses), and ability to use on the ground.

Using this weapon after Patch 27.2.0:

• This weapon remains a much smoother experience than the Fulmin due to the faster ammo recharge and the 20m range stagger effect on reload.

• This weapon remains a much more effective option than the Ignis Wraith for group clearing due to the AOE explosion on projectile attack contact with targets and the environment.

• This weapon has lost significant AOE potential.

• Continue to simply point and shoot (not near you). Shoot continuously (not near you). Shoot the enemies. Shoot the walls (near the enemies). Shoot the floors (near the enemies). Shoot the ceilings (near the enemies). Don't ever stop shooting (near the enemies). See the numbers, taste the violence.

• If enemies engage you at short-range, use your melee weapon instead to avoid chain-staggering yourself.

Builder's Note #1:
Using the above elemental combinations will result in the direct projectile attack delivering HEAT and VIRAL, the projectile attack's AOE explosion delivering RADIATION and VIRAL, and the AOE reload explosion delivering IMPACT damage and sentient resistance reset.

Builder's Note #2:
Since the numbers displayed above factor in critical hits, you should expect to see the following when viewing the weapon within the arsenal in-game:
-- Critical Chance: 62.5%
-- Critical Multiplier: 4.6x
-- DAMAGE, Heat: 580.1
-- DAMAGE, Viral: 549.5
-- RADIAL ATTACK, Radiation: 710.8
-- RADIAL ATTACK, Viral: 673.4

LEGACY GUIDE

Build created: 12/20/2019 (Empyrean: Ivara Prime 27.0.7).
Last reviewed and tested for efficacy on 02/22/2020 (Empyrean: Prime Vault 27.1.2).

The Red Dawn Edition is a special and pretentious designation that I use to denote weapons that carry harder than anything else in my arsenal. Please note that game patches may invalidate the effectiveness of a weapon and mod adjustments may render this build obsolete. This build is valid as of 12/20/2019 (Empyrean: Ivara Prime 27.0.7) and follows the principle of DPS (Damage per Second/Shot, i.e. Direct Damage) being greater than DoT (Damage over Time, i.e. Status). This build is considered an "End-Game" variant and is not feasible for newer players to attempt due to the associated resource cost.

Initially designed to compensate for the Fulmin's failure to immediately clear LVL 90 Exo boarding parties from allied Railjacks in the Veil Proxima and enable a single player to defend against excessive enemy numbers, the Shedu serves as a versatile weapon across the star chart and proximas (for any mission type, including viability for High-Risk Index credit farming, Elite [Sanctuary] Onslaught, and Arbitrations). Most importantly, this weapon is FUN to use.

Simply point and shoot. Shoot continuously. Shoot the enemies. Shoot the walls. Shoot the floors. Shoot the ceilings. Don't ever stop shooting. See the numbers, taste the violence.

For stupidly effective results, we recommend a full 4 member party of [Corrosive Projection] or 3 members with the [Corrosive Projection] + [Coaction Drift] combination.

Builder's Note #1: The "[Vigilante Supplies]" mod is selected above to take advantage of the set bonus. You may further improve the set bonus by equipping your preferred warframe or companion with Vigilante set mods. Alternatively, as your situation varies, you may prefer the "[Hush]" mod for stealth play, such as with [Ivara]. I find that the projectile travels fast enough to not warrant the need of the "[Terminal Velocity]" mod, however, please always feel free to customize to your personal preferences.

Builder's Note #2: In keeping with the principle of DPS being greater than DoT, the elemental combinations used are Viral and Radiation. The rationale for Viral offers a 20+% chance to reduce an enemy target's health by 50% for 6 seconds, reducing the time to kill. In practice, most enemy units are killed prior to the expiration of the status proc so this is considered additional free damage. Additionally, in cases where [Corrosive Projection] is used to completely remove all enemy armor, you enjoy a damage bonus against Grineer and Corpus fleshy units. The rationale for Radiation is that few groups may pre-coordinate to utilize [Corrosive Projection], increasing the likelihood that enemies may not have 100% of their armor stripped, thus Radiation ensures that you retain a damage advantage in this situation. In cases where armor is fully stripped, the small possibility of crowd-control is a nice quality-of-life addition.

Builder's Note #3: While the usage of Riven mods may drastically improve the performance of this weapon, due to the wide variance in stats, chance, and cost related to incorporating a Riven mod, this build is specifically designed to avoid the usage of such. This allows a straight-forward plan for building and modding which may be replicated by anyone which I consider to be a superior benefit. We all lift together.

Secret Builder's Note #4: The theory behind this build was to enable a player to deliver excessive AOE damage that could be used to [Suppress] hostile forces with the lowest skill cap possible. This relied on the dual mechanics of the weapon: The AOE explosion on the attack projectile coming into contact with something (enemy, floor, wall, etc.) and the AOE explosion on reload. The idea was that at mid-range to long-range, you could bombard the target with volleys of fire, hitting either the target enemy or their immediate surrounding area to deliver consistent damage capable of suppressing even large groups of high-level units. At short range, the idea was to create breathing room against the enemy units rushing you, relying on close-range AOE alongside the AOE explosion and stagger on reload to crowd-control those around you and regain combat initiative. This allowed this weapon to fill the role of a heavy anti-group weapon, if not the absolute best at single target damage.

To acquire, complete the Erra mission (obtained by using the [Paracesis] melee weapon to attack the large red crystal on a Sentient ship tileset in the Veil Proxima), then farm Symbilysts in the Veil Proxima Anomaly for the parts or purchase them from other players for platinum (Warframe.Market Link).