... You guys might shit on it, but that's incredibly smart on their part. Ten years or more of that button being there and now suddenly something else replaces it, just imagine the amount of people accidentally hitting the button and being introduced to copilot. This was a very deliberate change.
I'm pretty sure there's a term for it. Google did it with shopping and images, Instagram changed the home button with some advertising thing (dont remember the exact details).
This being "smart" is entirely based on the assumption that the average user who's actually trying to just get to their home screen won't be pissed when the bloated chatbot pops up instead. And that assumption is wrong.