Normally Microsoft seem so fastidious about our safety with tedious, near weekly security updates which we endlessly have to install. And yet when it comes to their own upgrades it seems they can break all the rules.
If they wish to run an empire then they need to understand they have to operate by the same rules they apply to their subjects. That's fundamental. If they believe that as rulers they live by different laws then that is the conceit of their undoing (as many Emperors have learned to their cost).
More practically speaking, if they believe their upgrade process is above all reproach and can bypass security protections as convenient, then the first hacker to get on the inside will be their total undoing.