I’m an artist myself. I understand the process. I’m not saying all new animation is bad, I’m saying people just don’t use traditional means anymore and it’s a dying art. Even modern companies still use animation saving techniques that I find more noticeable than the repetitive hallways and running scenes from Scooby Doo. Anime still does it. Mashle is a more recent example of over animation saving. (Why do you think there are so many episodes in an anime these days? )
Characters missing armor pieces, objects floating through other objects, straight up animation omissions have been caught so not all new animation is a hundred percent polished before getting out the door. I’m sure if I looked into it TMNT 2012 probably has some model inconsistencies. I’m not trying to make the case that if hand drawn they would have less errors, but they don’t always catch everything either.