One of the companies I was in actually blocked the entire MS Store through policy, but this results in most of Windows 10 going batshit insane (e.g. the Settings app will not even allow you to change keyboard layouts, because to retrieve language files it must go to the MS Store).
That reminds me of when they made it impossible to get rid of IE by making it a hard dependency of most of the rest of the OS. Why won't they get in as much trouble for this as they did for that?