Amphoreus is v3.0. Haven't seen it for myself yet but a chief complaint sticks out: The cutscenes like to fade to black and tell instead of showing characters do fun/cool things. Otherwise its been quietly positive.
Fugue has also been gone since 3.0 dropped. Grind and wait for a rerun I suppose.
Remembrance seems to be the new meta going forward but its not like your teams will become useless. Strong but no longer the strongest. (As a guy who still uses DoT.)
As another commenter pointed out, Lingsha is rerunning right now alongside Feixiao and Topaz.
It's probably a lot of small things adding up. ZZZ, WuWa, hell even the game itself has been adding characters with big flashy animations. I guess players just want more visually engaging storytelling on top of visually impressive combat.
Again I haven't seen the new stuff for myself yet so just treat me like a parrot.