yes, employers hate that, employees also hate that. dumb police is dumb police - union or HR.

HR usually doesn't do stupid shit like that because it reduces employer KPIs so even if they do that for some time it gets killed quickly. unions have different KPIs to optimise for and if they're pathological and/or parasitic, you get dumb shit like the above.

an union which is not a parasite is absolutely possible in the same way a non-exploiting employer is also possible.