Which is fundamentally true, and cannot be changed.
So if your employment situation is so bad that you need a second, massively powerful, self-interested entity to negotiate with the massively powerful, self-interested entity in the hopes that your interests may happen to align then a union is the right choice.
But if not, you are adding an order of magnitude of complexity to your political work environment (yuck) and will come to regret it.
And if it comes to pass, it is absolutely critical to structure the union in such a way that the interests are aligned with the employee members.