> It is more like 90% less quality

Which tool are you using and whats your tech-stack? my experience is not same as your in terms of quality, our stack is primarily Java

> It codes itself into corners that need to be completely refactored

This part is important, if you give full autonomy indeed code becomes mess, but then there are 2 aspects to it: (1) so what? it becomes mess, anyway is code read by agents and written by agents these days (not fully, but a lot). (2) eventually things get complex very quickly, that you wont be able to build mental models about the project, because it wasnt written by you, which forces you to use agents even more, leading to almost complete autonomy, at some point, you wouldn't understand the code anyways.