It's not thorny to me, but then I'm used to polite disagreement where I've found many would turn hostile, so perhaps your padding at the end was a good plan - even if not necessary for me personally.
You raise good points, but it's one of those "Don't let the Perfect be the enemy of the Good" things. No system can catch 100% of these problems that you correctly point out. At least, none that I can imagine nor that you propose.
Right now, Valve is the "best" video game distributor - apart from maybe GoG. I hope GoG dethrones them as the only reasons Valve is "better" are Linux support and market dominance (ergo convenience), and perhaps the AI craze will be the wedge issue that GoG takes a firm stance against, at which point they'd be in a good spot to take over.
Unfortunately, I strongly suspect the vast majority of consumers simply do not care if a game was developed with AI.
All that to say: I agree they should be doing more, but I wouldn't hold my breath.