I'm generally in favor of unions, but I don't understand the game theory under which an L3 up to L8 (for example) have enough in common that they would be a sin

I'm generally in favor of unions, but I don't understand the game theory under which an L3 up to L8 (for example) have enough in common that they would be a single bargaining block. Compensation and authority scale up pretty quickly in large tech companies. Also, much of that compensation is in stock, which makes the tech workers capitalists. I'm skeptical that you're going to encourage unionization by telling people they're evil for owning capital. So if the goal is collective bargaining power you first have to figure out what mechanisms need to be in place if L3 and L<N> have diverging interests. Then you need to figure out if waging a 19th century holy war against capital is important, in which case you have to make a case for why tech workers should give up the ability to be compensated by shares. Also if you want people to come together, maybe stop trying to bully them? Some of the comments on this thread are really beyond the pale.