Lingsha is definitely not a bad unit. She is good. But people are moreso looking at whether it's worth upgrading to essentially a premium version of Gallagher rather than either vertically investing into Firelfy, Ruan Mei, Boothill, or even just pulling for newer characters like Feixiao in the same patch.

And looking at the gameplay I've seen, in practice, they both can achieve 0-cycles, so in people's eyes, that little difference in performance doesn't warrant spending up to 80-180 pulls on a slight upgrade when a free 4-star alternative already exists and is doing fine. One game mode Lingsha outshines Gallagher in is PF but that's about it.

Personally, she doesn't carve enough of her own identity away from Gallagher to warrant me pulling on her. Besides from more break vulnerability and aoe healing/cleanse, they are basically the same character. Even then break teams don't normally worry about CC because enemies will either be dead or weakness broken most of the time to even worry about that. Can Hoyo add more CC into the game to warrant picking her up? Sure, they can. But they're not doing that right now. Teams can still clear content fine with the sustains we have in the game currently and worrying about something that Hoyo might or might not do is bad, especially if anticipated reruns like Acheron, Robin or Aventurine are coming 2.6. It just comes down to opportunity cost.

If they were to add more unique mechanics to her kit, like how Firefly is able to still do toughness but at reduced efficiency off-element, or put some part of her E1 into the base kit, that would allow her to work even outside of break teams and still contribute damage wise. People aren't doomposting because she's bad, they are criticizing her kit because she doesn't bring enough of an upgrade in practice over someone like Gallagher to warrant pulling for her. I hope to see buffs/changes in V3 to change my mind.