They literally said to work with your hands in your pockets so that you wouldn't be tempted to take over and get distracted

Yeah this is my experience with managers, alright. When they weren't around, the actual work to be done always seemed to go just fine! Happy worker anarchy!

My supervisor's role in various jobs I've had was usually to hang out in their back office or chat up other management -level staff all day. Occasionally opening Excel and punching in some numbers once a week. Not to mention the hard labor of scheming up something they could neg you about so you'd feel pushed to make them look better.

That manager probably started off doing the job you were doing and got promoted by kissing ass or being a toxic worker

This. The company will promote its "true believers" who think shift-managing a MickeyD's is their life's plateau, who will take the company line as sacred gospel and punish any whiff of potential heresy.

Provide what their workers need? Maybe it was this way at one point. I feel the role of manager now is the job of an idiot task-master, to convince their employees to work harder without what they need.