Unless you're planning to intentionally use the weaker Nyarlathotep for whatever reason, Hades is the only dark SSR with an A-frame atk down. Nyar being one of the only 2 SR and has a weaker debuff, the other one being a future release that requires a dot on the enemy for the atk down to even take effect.

It then doesn't help that every dark B-frame debuffer is time limited, making any player without one of them basically stuck with Joan+Sniper or Dart+Trial if you want some proper debuffs.

If your running raid related stuff, sure, do whatever you want but for anything that you can't get carried with, Hades is very important to have in a dark team, even without her awakening.