I don't expect the FAs to know the difference, but at least from the technical perspective, one is shutting your computer's power off, and the other is not.
Why do you think that FAs would not know the difference? They have computers, too. They know how computers work. FAs are a bright, intelligent group of people, and I have a lot of respect for them.
The rule is "POWERED OFF". I don't care if you think the rule is dumb; it's the rule. The snooty DYKWIA types are the ones who think the rules don't apply to them, and that their need for electronics supersedes everyone else's need for safety.