if you manage to make anime hair that doesn't clip into any part of the model you're god. I don't think you can even avoid clipping when other parts of the model have physics but at least they make it move nicely I've seen fuckers just give hair cloth physics and call it a day
What I think they really need to work and I've said it before is mouth tracking, sometimes when they do closeups the model has a blow out doll face. I assume they do the motion capture and do a lot of post production to fix issues, having software that could emulate mouth movement to the vocal track shouldn't be that out there, specially nowadays with AI.