Except when it deletes the windows.old file
When my internet connection had an issue, (following a new modem the day before), I found on my main PC that a troubleshoot followed by a reboot fixed it. So I did the same on my laptop ... too late I realised it may have been "Restart and Update" .. spinning dots scenario from the Win 10 Anniversary update ... system restore "couldn't find save point" (another known bug) and though I could get into safe mode and back up that day's work the update completely screwed up this time to the point where even the distro created at the time of the Win10AU wouldn't install either. I tried a second time and the Windows.old folder has now also disappeared.
I sympathise that unlike Apple they have 15m+ combinations of hardware to be compatible with. However I'm not the only one faced with either (another) 2 days on the 'phone to Microsoft or paying for tech help (when I've finished moving home).
Not a happy customer. (Case law in the UK, dating back to the mid-90s also states that software must be "fit for purpose").