There’s a lesson to be learned from all this. We all tend to be lemmings on occasion, especially when we have reason to trust popular opinion. And we have had good reason to trust Apple’s track record as far as Mac software, updates, and upgrades are concerned: things usually got better in some way, we have rarely been let down, and there have almost never been really serious problems. But s*** happens, and when it does, it will be unexpected. So: short of expecting it, prepare for it.
The lesson? BACKUP, BACKUP, BACKUP!!!
After losing all my data TWICE decades ago (actually, that had nothing to do with Apple, but my own carelessness, but I, too, have a tendency to be a lazy lemming), I began to take back-ups seriously. I discovered bootable clones (SuperDuper! is my choice), and have been making them regularly since (the price per megabyte of external ** drives has gone way down since I began, and now it’s downright cheap, and they're better). Time Machine and Time Capsule have been valuable additions (but not always 100% reliable), but I never stopped making clones. I used to do it daily, but weekly is now usually enough, EXCEPT I always make one right before any update/upgrade, or when I take my Mac on long trips. It’s like fire insurance, or those oxygen drop-downs in planes: you hope you never need it, but if you do, you REALLY do. To be sure, I’ve only rarely needed the clone, but when I have, it’s been a life-saver, and this 10.11.1 UpdateGate (I think it has legitimate claim on that name) has been a great example. I knew my Mac and all my data was safe, and except for the time I spent trying to get the d*** update to function (unsuccessfully), I was back at work thanks to my clone in half an hour. No stress, no sweat.
Meanwhile, as far as this update is concerned, I’ve decided I won’t even try to fix it. For me, at least, it’s not really necessary. There are too many elements in play, and regardless how good the fixes which have been proposed seem to be, I think the whole toxic thing has to be re-worked by Apple, and hopefully corrected with 10.11.2.