That's not been my experience at all. What union of IT workers does this? Where are you getting this? I've been in unionized workplaces (Europe). There's been

That's not been my experience at all. What union of IT workers does this? Where are you getting this? I've been in unionized workplaces (Europe). There's been a minimum but never a maximum and the sliding scale is not driven by seniority with the or union as you say. I'm afraid you might extrapolating from things you've heard about factory type unions.