Windows Update can forcefully power-on a sleeping laptop, and then do 100% CPU load for a decent chunk of an hour whether you like it or not...
... while your laptop is in your laptop bag.
This destroyed one laptop for me already. It very nearly caught fire on a crowded train with no way to even throw it off for safety.
I keep saying: Microsoft will keep ramming this crap down people's throats until a laptop catches fire on a plane and a safety agency or two gets involved.
PS: Speaking of VMs and Windows Update -- the most hilarious thing ever is when 40,000 virtual desktop VMs forcefully run Windows Update all at the same time on a shared storage array. And then reboot to the golden image, resetting them to the previous state, from which they dutifully try to patch themselves. Again, and again, and again...