I don't think becoming a worse coder is necessarily a big problem as long as code review really happens, as long as the human in the picture retains their algorithmic thinking there is no lobotomy. Of course we all know how human laziness works, so thinking that people would actually keep reviewing code after they find no major issues N times in a row is a pipe dream.
And I don't know about you guys, but I for one dislike reading someone else's code. LLM generated blocks can be especially bad for testing my sanity.

