That title reeks of the paper equivalent of clickbait. The paper is about subjective well-being and mental health in the psychological sense. Broader well-being includes material conditions like income, housing, health care, safety, and social connections. So a null result on subjective well-being is not necessarily a null result on material welfare, and the problems that leads to. The paper’s own abstract also talks about context effects rather than a simple universal null.
> https://marginalrevolution.com/marginalrevolution/2022/10/ar...
Unions are not perfect, but they have been an important check on exploitation. Organized labor helped win the 40-hour workweek. If you demand perfect solutions, you end up doing nothing. And given that you're up against people with nearly unlimited resources, you can't afford to be picky.
https://marginalrevolution.com/marginalrevolution/2022/10/ar...