The obvious main problem is older and non-standard systems which can run the release version of W10 but will later suddenly become unusable due to an update. There's already plenty of old systems (some XP!) which have deliberately not been updated so that old software and hardware will still run.
But there's another problem when most people can't refuse updates. They will be forced to take anti-piracy updates which disable important functions because the copyright agencies demanded it. And updates which disable security and encryption because the NSA demanded it.
So you won't be allowed to fully access your system, but the NSA will.
Biting the hand that feeds IT
