[mothered]

The Developer Preview/Beta release of any OS, do tend to be problematic to some degree.        

That said, the Issues you've outlined Is totally unacceptable. Particularly It's Incompatibility with drivers and loss of functionality on boot-up.

apparenlty the new update for high seirra is still a drama for some people.

I just can't fathom how It can be released for public testing with so many flaws.

Sure, a few may be expected, but not to the nature and magnitude of your experience.