The challenge with unions is that the same/very similar anecdote keeps on coming up.

I am not anti union (wouldn’t want to be part of one, but don’t ideologically oppose them), but this seems to be a consistent failure point for them, in the same way that Scrum often ends up generating hairball codebases.

The concerns people have with unions are not particularly amenable to statistical analysis. However at some point a sufficiently large collection of anecdotes does become data. Pretending people can hear stories of union-related BS so many times or for so many years and not take that into account is silly.