Re: Twice yearly roll out of incompatabilities
"Now that Microsoft has got a large number of machines being upgraded when it wants it can start to roll out code that breaks other systems"
That used to be their MO except that "other systems" were previous versions of Office. Then they had a panic attack when Open Office formats became ISO standards. Big organisations like specifying ISO standards so they were in danger of seeing OO formats being specified by customers. They reacted by getting their own "me too" ISO standard. That left them stuck - they couldn't play the old game any more and it also left their own formats a sitting duck for OO, LO, Old Uncle Tom Cobley and All to work on.
So I don't see quite how they can revert to the old game as you suggest although, of course, Charles Simonyi has re-entered the building... https://www.theregister.co.uk/2017/04/18/microsoft_charles_simonyi_intentional_software/