That’s true, I guess I think bad explanations of good rules are insidious: they alienate kids and create an us-vs-them mentality. If parents stay up late but don’t allow their kids to stay up late, it seems like parents are entitled and even a five year old can sense entitlement.
Here’s the thing, though: it’s true that going to bed early is a good rule, and it’s also true that parents feel entitled; that their rules apply to their kids but not them. That’s one reason kids hate their parents - they often deserve it!