I do still disagree with your assessment, I think the syntactic tokens in programming languages have a kind of impedance mismatch with the tokens that LLMs, and that the formal semantics of programming languages are a bad fit with the fuzzy statistical LLMs. I firmly believe that increased LLM usage will drive software safety and quality down, simply because a) no semblance of semantic reasoning or formal verification has been applied to the code and b) a software developer will have an incomplete understanding of code not written by themself.
But our opinions can co-exist, good luck in your game development journey!
As far as QA goes, we then circle back to the tool itself being the cure for the problems the tool brings in, which is typical in technology. The same way agile/'break things' programming's solution to QA was to fire the 'hands on' QA department and then programmatically do QA. Mostly for cost savings, but partly because manual QA couldn't keep up.
I think like all artifacts in capitalism, this is 'good enough,' and as such the market will accept it. The same way my laggy buggy Windows computer would be laughable to some in the past. I know if you gave me this Win11 computer when I was big into low-footprint GUI linux desktop, I would have been very unimpressed, but now I'm used to it. Funny enough, I'm migrating back to kubuntu because Windows has become unfun and bloaty and every windows update feels a bit like gambling. But that's me. I'm not the typical market.
I think your concerns are real and correct factually and ideologically, but in terms of a capitalist market will not really matter in the end, and AI code is probably here to stay because it serves the capital owning class (lower labor costs/faster product = more profit for them). How the working class fares or if the consumer product isn't as good as it was will not matter either unless there's a huge pushback, which thus far hasn't happened (coders arent unionizing, consumers seem to accept bloaty buggy software as the norm). If anything the right-wing drift of STEM workers and the 'break things' ideology of development has primed the market for lower-quality AI products and AI-based workforces.
At least the horror stories about "all the code is broken and hallucinations" isn't really true anymore. If LLM's will succeed anywhere it will be in the overly logical and predictable worlds of programming languages.