Nah you got it twisted. Or I wasn't precise enough with "policing". I figured that implied "overly aggressive" but apparently not. Obviously there are reasons to assign seats. But once those reasons are moot (e.g. everyone is boarded smoothly, opportunities to up-sell have passed, etc), let shit slide.
People taking they eyes off the prize. The purpose of seat assigning and enforcing assignments is to prevent conflict during boarding. But here, sleepydude broke the rules and waking him up and forcing him into his seat is a conflict. Let these folks move, and that conflict's averted and everything just carries on. Instead, pick a fight with them over a thing that doesn't matter and create a conflict. Just dumb prioritization, chasing letter of the "law" instead of the spirit.
That's not how it fucking works. You think the job is over once everyone is boarded? You sit in the seat you are assigned to. End of story. How is this even a point of conflict? Yea, let's let this guy just do whatever he wants and sleep across an entire row just because. No, you follow the rules that are set.