Windows can boot and still be fucked. User can login and still be fucked.
Explorer crash and respawn loop. Taskbar not responding. Windows failing to update and still hogging every reboot. Networking settings get fucked up.
Also booting and even logging in does not mean a person can actually use his computer for his purposes. OneDrive deleting your work files from your laptop can fuck up a guy on the go.
Of course these people are not part of a bigger organization that managed their machines, just like OP's mom. If anything I would say your experiences in IT out you out of touch with most PC and even Windows users.
A 2kg thermobaric warhead for RShG-1/RPG-27 has a 10m lethal radius. For 100m you would need something far bigger.