Thinking back on my favourites, I think 2D is my go to, and the 3Ds that make it into my favourites are the exceptions.
I find it's the concepts of what's occurring, not the visuals themselves, that matter more.
I've never watched one, only heard them as part of a collab, so my thoughts are that they are regular youtubers who apparently pay for software I haven't seen.
Either put in a good animation, or do no animation and spend the effort on expanding the game in other ways. Mid or poor animations don't contribute to a scene, IMO.
Either single playthrough or have two distinct paths that don't cross over (like Love and Corruption paths) so you can just go with one or the other at the start and never change.
Having a great number of variations of scenes or conditions for unlocking scenes is not a good thing with games...
If they grant some benefit like upgrade points so they're an option to grind ahead of the level you'd be at through normal progression, then I like them.