> Working to the point where your mental health suffers is your fault: it's your responsbility to establish healthy boundaries or, failing at that, quit.
It's interesting that the manager and/or employer has no apparent agency here.
Sure they do. But their agency doesn't eliminate yours. You can't control what your employer does. You can control what you do. So the correct thing is to exercise your own agency in response to theirs.
So once the collective agrees they want something they will form a union to bargain collectively. But so far developers don't agree about anything so they don't, because the collective feels that they get enough from their individual contracts.
Why? Unions work the best when they are formed around a cause everyone cares about, that is how we got workers right in the first case, there is nothing that says you need to form a union when things are good.
Because at the time you want to form a union due to things being bad, your employer already has the workers in a position of fear and control, and they have reasonably free reign to do whatever they want and toe the line of illegality when it comes to intimidating workers who are discussing unionization.
Talk to a union organizer about this. They'll help you understand how this type of monopsony looks to a worker when they're trying to organize.
It's interesting that the manager and/or employer has no apparent agency here.