How would you know?
If you didn't know Rust already, how would you know the LLM was teaching you the right things and the best way to do things?
Just because it compiles doesn't mean it works. The world is full of bad, buggy, insecure, poor code that compiles.
This is akin to be on tutorial hell and you “know the language “
In particular, it helped me write my first generic functions and macros, two things that were pretty intimidating to try and get into.