Power Leveling is an flaw and decreses the personal value of a Max level character.

[Vahzl]

Like I said, the grind does not have to be the same monsters/leves for hours on end. In fact it shouldn't be, because that's boring. But that's a flaw with game design that FFXIV should deal with by making the grind more enticing and interesting through content and game design, instead of removing leveling from an RPG, which is just another form of bad design.

But you didn't answer my question, what about it is not RP?