OK, unpopular opinion follows, bring the downvotes. 1) All of my experiences related to unions have been negative. Things become more bureaucratic and inefficient ("oh no, you can't move that box, we need to wait for the union person whose job description is to move the box"), people are promoted because of seniority and not because of merit, bad performers up to and including flagrant criminals can't be fired becaus…
The us-vs-them situation has always existed and it's always been political. It's been the monolith of management vs an individual worker. If you can't imagine anyone but blue collar workers having a union I'd point you to the various unions of Hollywood. If FAANG is as cushy as you say, there's not going to be any contentious labor disputes between management and workers. But unions would balance the power between them.