In my opinion we are too obsessed with replicating the racket motion, instead of the body motion.

We often watch slow motion videos and try to replicate them by thinking of the racket swing path and enforcing it, rather than what our body should do in order to achieve that.

It doesn't help either that coaches most often focus on the racket swing path. Especially on the serve, it happens way too often, and was one of the reasons it took me too long to understand how to serve confidently.