On paper I get what you're saying but in practice it's not always that neat. Granted the best solution is just do the building wide break which was standard procedure pre covid. Some areas the flow is still coming and it's not always as simple as just work at the same pace and let it take longer(small sort tilt tray line for example). Also the idea of the sort just taking longer isn't appealing to most people I know. By the time the shift is getting close to the normal end time most people are itching to get out the door.
I know the logic that if you grieve enough management might start making changes but one problem is that you aren't filing grievances against the person who made the decision which lead to supervisors working, but the part time supervisor who at times is stuck between a rock and a hard place. Also I know I have much more respect for sups who will lend a hand when needed vs those who just sit back and watch an area burn down. So morale comes into play also.
You sound like a fairly new guy.
It absolutely is as simple as working at the same pace and letting it take longer.
It doesn't matter if people want to leave.
Contractually speaking, the work is to be done by hourlies. Not management.
I do not have more respect for supes who work.
I have less.
We have an agreement. A contract. I expect them to follow their parts of it, just like they expect me to follow my parts.
And when you grieve a PT supe, trust me, the center manager ends up wanting to know why, and he generally ends up talking to the FT that made that situation happen.