It really feels to me like Microsoft just push out a half-baked v0.5 product these days with only 50% functionality of the established product that it's replacing.
They wrap it in marketing hype of "new" Outlook, "new" Teams, etc, and encourage their business users to "try it out", essentially as free beta testers.
What they don't tell you is exactly how much functionality you'll lose as a result. This results in so much lost efficiency for us as we fumble our way through it trying to work out how to do our jobs in an essentially separate product, only to realize that we can't do our jobs in it and then waste more time switching back
I'd just like to to see a feature matrix of old vs. new BEFORE it switches so that I can make an informed decision and not waste all that time.