I actually think this is the wrong way of thinking about it. While Silicon Valley may be unique, that just means the things workers in those jobs want to focus

I actually think this is the wrong way of thinking about it. While Silicon Valley may be unique, that just means the things workers in those jobs want to focus their collective bargaining around may be unique, too. Not working in Silicon Valley, I won't pretend to know what those things are, but I certainly know that every workplace has issues and that without unions, the power structure is completely unbalanced in favor of management. OP mentions sexual harassment. But if the workers wanted, they could actually collectively bargain even STRONGER sexual harassment policies than management wanted!