The quality of code available for LLMs to learn from is normally distributed with the peak around "shouldn't pass code review".

What experienced developers write code at would be on the top 5 percentile, and are used to their colleagues to do the same. The effort put into reviewing code, also takes that into account.

If a team member starts using LLMs to write chunks of code, the quality will at best have the same normal distributed peak as the learning data. Which is a incredibly waste of resources, as you now have to spend 10x more time on reviewing the code, regardless of how often it ends up being ok