My take is that Microsoft assumed that everyone is calling it Microsoft 365, which they don't.
30 years of owning the term "Office", having almost every single person who ever touched a computer know that Office is the Microsoft office productivity suite, then deciding that a sort of working, but yet to be 100% defined LLM is more important. The fact that no one stopped this or that shareholders aren't pissed tells you something about how absolutely broken modern computing is.