It only has to happen once.

Besides which, a predictable failure is still a failure. By your logic, Win95 crashing several times a week wasn't a problem either.

Win95 crashing several times a week was a feature that would let you get away with not seeing this other bug: https://support.microsoft.com/en-us/kb/216641

This thread is predicated on the assertion that users lose 10 or even 20 hours per week to reboots. Not just once.