Owned Macs since 1988. They are computers. Glitches happen. Maybe some of you were not around during the good old days of extension conflicts. Great way to piss away an hour of your life -- but thank the lord for that awesome app Conflict Catcher.
OS X 10.0 and 10.1 were completely unusable -- as public releases.
Then there was the OS X update that erased people's FW hard drives. That one was a hoot.
I've given Apple a lot of crap lately about them become rather boring and undisciplined. No fan of TCCo. these days for sure. This isn't one of those times though. Honestly, this crap is going to happen, Win, Mac, Linux, whatever. These are massive backends engineered by rooms of people. People. Get over it.
This is why you always keep a good bootable back up. Otherwise just click your heels three times and wish you were back in 1901 sipping a Pepsi at the drug store counter watching the parasol girls giggling.
I've been building PC's for 6 years now never encountered a software issue this large on W7 or W10. It's completely unacceptable if Apple cannot make a new stable OS every year then they need to make less releases.