I started digging into the historical blog posts, GitHub comments, etc. and I realised everybody at MS who'd been working on them, SWEs, PMs, architects, etc. had either left the company, or moved to other teams. And the one constant about the internal moves was that people were now working in some "AI" related project or product. Literally, I didn't find a single person who wasn't now working on AI.
Clearly, there has been a huge internal push to get into AI. Resources have been reallocated, and anything non-AI related has been starved. And since working on an AI project is probably considered the only route to advancing your career, anybody with any ambition has moved to a team doing something AI-related. The result is that huge numbers of products and teams doing vital but non-AI related work have been hollowed out, and now we're seeing the consequences.