> Just like it's acceptable to reboot a computer without a user's permission, losing all their work

This is something I've found fault with in Windows, and was greatly disappointed to see happen in Sierra.

I had been getting the High Sierra update reminder notification once a day for several days and normally just clicked "Remind me tomorrow" (since there's no option for "Don't remind me"). One day after having it pop up, I instead clicked "Try in an hour".

I expected this to ask me again in an hour, at which point I would choose whether or not to proceed with the update. Instead, while my MacBook was asleep with work open, it went ahead and updated the OS without my consent.

I don't (think) I lost any work, as I typically save things and Vim didn't leave any swp files. But the experience was disconcerting and bitterly reminiscent of Windows...