One of the cool things about LLM-assisted language learning that I have found is this:

Language is (for almost every adult) deeply personal. Even the best of teachers must be so nuanced for every error correction, repetition request, nudging, encouraging, etc. Why? Because the adult student is greatly affected by human feedback in this context.

This is one of the (many!) reasons why children learn languages (their first included) kinda fast. Their ego isn't involved.

Learning with a non-human, at least for me, is kinda cool as I don't feel bad telling it "look, I get it, don't ask me that again" and I don't take it personally when it says "that's not quite right."

I've got tons of experience as both a language student and a teacher, btw.