Yeah I guess.
Also speaking in general, realistically only creation DF(para and logias) are the only one's who have AOE's that you could even fit in such a range defining system. Never really liked setting a range value in RP anyway since how do you calculate? Unless every post is and now I'm x meter away from the target and the next post from your opponent goes, and I move y meter to the other direction. Its only use is in close combat to define your punch hits or not.
I get the sentiment to limit AOE to some degree as there is a point where those things become autohits, but unless you're a total newbie at this game I really don't see anyone around here taking advantage of that.
Exactly lol, meters are barely used in RP anyway, so it's just silly.
The way we usually did it in WURP was just use canon attacks as units of measurement.
So if you make a custom technique, you can say this attack is Entei-sized. Or Hiken-sized. Or w/e. That's at least relevant. Meters make no sense. Whenever you RP walking down a street, when do you define how long and wide the street is, and how many houses are in a 60 meter radius, and how many civilians are in those houses, and so on? lol
Nobody does that, so this is pointless. As for only Paras and Logias having this... I mean, mostly. But swordsmen also have it. And Garp destroyed a mountain with his punch.
Edit: In fact, even when I do use Raigo, I won't say it's island-sized or anything. I'll say it's a huge ass thunderstorm. Deal with it with your own huge ass attack. But I definitely don't intend to make it 60 meters because it'd look stupid lol. A weather egg from Nami releases a storm bigger than that instantly, but my legendary warship has been pumping this storm out for the whole time on the island and that's how small it is? Nah xD