I don't know USA very well, so that is just a feeling.
- a lot of what the union do/did have to be understand in the context of important fight between the unionized worker and the companies that want to undercut union influence (and often undercut workers right)
- a lot of thing union do / used to do, make sense in the past, but are less relevant now.
- Human is quite good to do stupid things, to create some bureaucracy / rules... That applied to companies (Bullshit Job being one manifestation of it), but also to union
- We tend to notice more the bad things than the good things...
- Humans tends to love power and hate change... that includes human running unions