If you don't have a power meter then there is really no reason to know them.
Huh? If you don't
have something, there's no reason to want the definition of related things? So, I'm reading about the Large Hadron Collider because I think it's cool and I come across an acronym. Since I don't have one buried in my backyard, I don't get to know the meaning?
You are reading a lot more into that than what was actually written.
Well, that's the gist of what it sounded like to me and I exaggerated a bit to make the point.
I guess my main point was that it seemed rude to reply to the question with a "you don't need to know". If someone were to come up to me in person and ask a similar question, I would think that most people would consider a response of "you don't need to know that" to be overly judgmental and rude wouldn't they?