> In the past, software engineers had a lot more agency than they do now, because nowadays the supply/demand ratio no longer favors software engineers, and as a result we have weaker negotiation power. Now we're more afraid of being fired and not being able to find a job, and managers aren't afraid of us quitting and not being able to replace us.

This sounds like a job for unions. It would have been advantageous to have formed and joined them before so much power was lost, but it's easy to be shortsighted when you're happy and comfortable with where you are and ignore that the situation could easily change, if not for you then for the next generation. Companies are happy to leverage every advantage they have against workers. Unions can be a powerful tool for workers, one that could help solve a lot of problems current and future, and it's sitting there just waiting to be used.