Comment by WarmWash

Ehhh, the darkside is that unions often levelize workers into bins to negotiate fair wages for that bin. This is good if you are a weak player and bad if you are a strong player, because it removes the incentive to work any harder than the weakest link - there is no reward for that. So if you know how the job works and are good at it, unions kinda kill the whole thing.

Pro unionists will tell you that you are a sucker for being a good worker anyway, there is no reward, but what else would they say? Look at all the people who have independently moved up in a company or hopped jobs for better pay? Probably not.