There’s another bigger problem here to my mind:
Visual style is not the same thing as Animation.
Like…Garnet’s wedding dance from “Reunited” is actually very NICELY animated! It’s fluid, it’s dynamic, it’s expressive! It does the thing animation is supposed to do and uses Motion to communicate Narrative.
Buuuuuuuut Garnet’s got a big goofy grin on, her proportions are not entirely “on model” (for the sake of facilitating the big expressive dancing) and the perspective is relatively flat, erego it is “bad” animation.
Except that all of those things are and have been from the very start deliberate aspects of “Steven Universe”’s visual aesthetic. An aesthetic that is connected to the show’s animation by virtue of having that aspect in mind at a design level, yes, but it’s not really the same thing.
The OP’s problem isn’t about animation, but stylistic preference. And that’s a preference which they have every right to! But it isn’t something that can be conflated with nor draped in the supposedly objective legitimacy of citing the animation itself as bad.