I still haven't unlocked RoF on mnk so I don't know how it will feel but for now I don't see the problem with it. mch and brd also have skills that change their gcd and make it faster and I don't have any problem with it. For mnk, I guess the rationale behind rof is mnk trying to put more power into their fists so they have to "charge" and slow down to muster their strenght. I like the idea and it makes double weaving easier. It probably just needs some time to get used to it.