What is probably the most useless rule in the amateur radio world can be found in 97.313 concerning transmitter power standards:
a) An amateur station must use the minimum transmitter power necessary to carry out the desired communications.
It’s purely subjective without any engineering standard or guidance. Perhaps my “desired communication” is to be able to hear your signal over every other on the band, in which case you legally must use a LOT of power — maybe the legal limit.
Even better, if you’re transmitting using five watts and I can’t copy your peanut whistle, are you in violation of this rule? After all, you aren’t using the minimum transmitter power necessary for us to carry out the desired communications.
And here’s a thought — if you’re using a low-power transmitter and can’t turn the power up to the minimum required for us to communicate, should you be fined or lose your license?
I think you get my point. It’s a stupid rule.