I had hope for her face animations... Sakurai said something like "all characters are now more expressive", and Rosalina still only has a maximum of 2 faces you can actually notice: o-shaped mouth, and closed mouth. She sometimes smiles when UpAiring, but well, she just is... herself, I guess. Nothing out of the ordinary I'd say.
Wonky dress physics that mess up photo opportunities
I know you have strong opinions about a lot of stuff, but that is something I just have to disagree with. They aren't wonky at all. Her dress now reacts properly to surfaces (which is quite good), to her leg movements, her hair, although still clipping through her neck during Bair, is fully animated and flows more naturally to the wind, so does her dress, so... well, no. They're aren't wonky. They just changed, and change is something you seem to have a hard time adapting to.
Just feeling really lukewarm on her in Ultimate overall, she feels like such an afterthought. I'd say this is her last Smash game.
Then enjoy it, because it may indeed be the last time.
But still, I wouldn't say afterthought. She got many "mechanical" changes, or rather adaptations to her kit, and they weren't made randomly. Luma FS kills at the ledge so early, UpAir kills as soon as in Sm4sh, Fair is now actually usable, Starbits are now included into her special B-game...
I mean, Sm4sh Rosa had moves she'd basically never use. Fair was almost absent, and there are matches where... you wouldn't use Starbits at all, because Luma outranged everything already, with jabbing for instance.
Now, all her tilts deal more damage, she has new technique(s) which secure kills easily (Lunar Dash, up smash for some characters), she still can grab a character and Luma will way for the release to instantly kill them above 90%, which is crazy, because Rosa's grabs can't actually kill until very late.
She's also heavier, so dies less often, and Luma has more HP, and now reacts more quickly to her movement, and Luma deals more damage and can tank more damage when untethered, and Gravitational Pull has been changed to leave room for counterplay and yet still be the best projectile denier of the game, she's faster, she... I don't know, you seem to sleep on many changes that were made to her. They didn't just tweak her randomly. They made actual gameplay-changing modifications.
DAir is slower, yet Luma's angle is still absurd, so kills early. Still has a meteor effect.
Thing is, Rosalina got a tad better, and everyone her got a lot better, so relatively, she feels weaker. Yet you can still oppress heavies easily, fast characters are usually good against her, but Luma denies many of their moves, and, and...
When the time will come to establish her matchups, I'm pretty sure they won't differ a lot from Sm4sh. Characters she dominated, she still dominates them quite well. Characters she lost to got, overall, weaker (well, not MK lol), so she has higher chances of winning.
She isn't an afterthought. It's game balance, and game balance isn't about "better/worse". Sometimes, it's about changing a playstyle, and that's what they did. Or tried to do, if you prefer.