I think it's that plus the fact that she's a Pyro dps. There's just way too much competition there and the unique thing about her - being able to apply pyro with her normal attacks, makes it so it really limits who she can work with to pair for elemental reactions because she applies it so quickly. Supposedly her "best" team is an Overload comp with Fischl and Beidou, but I personally find Overload to be annoying to deal with since it knocks enemies around. Though I guess that's less of a problem with a ranged character.
But as a single-target pyro dps she's just inferior to Hutao, so nothing really meta-changing about her.
But as a single-target pyro dps she's just inferior to Hutao, so nothing really meta-changing about her.