I'm not denying that it's a complex or costly process, just lamenting that they don't care enough. Of course, the problem is compounded for me by the fact that at any given moment I end up having 3 different enterprise chat apps open on my work laptop for collaboration with outside parties.

And the result of that knowledge is a worse experience for users. However you frame it, users are losing because MS doesn’t want to shell out the cash for good UX.

Losing, but still buying in.

The users aren’t really, their bosses are, most likely because it gets bundled in a contract with Office and Exchange etc.