Software quality has been declining for long before AI was a thing.
Microsoft didn't need AI to make windows 11 as bad as it is.
The incentives are large companies are fundamentally not in align with making high quality software people actually enjoy interacting with.
I think MS devs don't even use their windows OS. How do I know this? Because every week my favourite applications list gets reset. Why would anyone do that?
In fact, I am pretty sure most of the examples he lists predate AI. Mac OS apps stealing focus certainly does. Horrible laggy car infotainment systems--hard to say without any specifics, but I've certainly had the same experience pre-LLMs. I've navigated the LG website pre-LLMs and it was busted then too.