It depends what you're moving - and for good reason. Unions remain strong in industries that continue to have dangerous work environments. Film sets are controlled chaos with very high powered electric lights/equipment, cables and cords everywhere, and sometimes uniquely unusual (read: dangerous) work demands - high ropes, scaffolding, helicopters, pyrotechnics, intentionally crashed cars and other practical effects.
When I was starting out in the industry - before I was Local 600 (camera dept.) - I think I scoffed a little bit about the "my job"/"not my job" stuff; however, in most cases there are some legitimate safety/efficiency/equipment protection requirements backing those decisions.
Not only that, with a large group of people you can't trust everyone to have the judgement to tell exceptions to the rule. So it works better to just have everyone learn a simple rule like "don't move anything"
When I was starting out in the industry - before I was Local 600 (camera dept.) - I think I scoffed a little bit about the "my job"/"not my job" stuff; however, in most cases there are some legitimate safety/efficiency/equipment protection requirements backing those decisions.