Far from the richest by capita, average income, PPP average income, mean/median household wealth, etc., which feels like what we're actually talking about here. A lot of countries in the EU/Europe that would make the US look far worse, no?

Either way, no, if unions don't reduce how much people make and provide stronger worker's rights, protection from corporate abuse, workplace safety, collective bargaining for things like holidays, you can think it doesn't change your take-home at all and pretty undeniably see the benefits. How many weeks of legally mandated paid time off do you get, and how many additional days do you get on top of that as a median worker in the US? :b

No. (And comparing one country to another seems fine anyway.) Hard to make the case that unions in Germany have had no effects on wages, working time, etc.

Real wages are higher in every EU country with strong unions.