I think this was at least partially a result of the high crime rate in the cities.
Yeah, I remember the Valley in the 90s... a lof of it looked a lot like downtown LA which I'm was never exactly a fan of.
But being in San Jose back then in the 90s looked and smelled like Chinatown when it was buzzing, Sunnyvale and Mountain View had a certain feel that is completely gone now it felt electric for reasons I didn't full understand and would only come to realize how significant what was happening there was a decade or so later.
I never went to the East bay until recently, but that feels like a very watered down version of what it was back then to me.
I guess it's survivor bias guiding my words, especially since I had close encounters with stuff like that growing up too; but having a choice of which one to deal with I'd stay with 90s CA to raise a family then somewhere like modern Geneva with all its amenities and manicured existence.
It was with the opening of the commercial Internet in the 90's that it all started changing. The new companies weren't in boxed products destined for retail: they started replacing retail. You didn't go to a users' group to learn, you subscribed to Usenet or email. And so on. So even by the early 2000's, things started to feel hollowed out in SV.