I think that keeping the code that the LLMs write relative small and highly focus will lead to a code base that's easy to maintain over the long term.

I plan to create an app that relies heavily on LLM written code. I'm hoping that if I architect it as if am working with a team of programmers I'll be able to create a code based that I can update over the long term. I'll assign it assingments that I can then merge into the master codebase. You're in the same path. That's 2 od us. I think it will work out. We'll get what we want while saving a ton of time.

Code "quality" is a judgement call. Just like some LLMs, I'll repeat your question: What do you consider quality code?

I treat all code from LLM, search, stackoverflow, etc, as "sample code" that requires review and most likely modification, or writing the code from scratch. Your abilities and laziness may vary.

Also, there are reasons other than code quality not to trust LLMs.