When I do that, they come back with something more simple than before but either wrong or still unnecessarily complex.

Over the past week, I have been writing a small library for midi controller I/O and simple/elegant is the priority. I am not really that opinionated. I just want it to not be overengineered. AI has been able to make some suggestions when I give it a specific goal for refactoring a specific class, but it cannot solve a problem on its own without overengineered solutions.