I just don't like the idea of removing skill expression and depth of play and counter play on both of the MNK's and the opponents side of things. I don't think making things in line with each other is also healthy since it's what brought pve in the dire state it is right now. I'd hate to see pvp undergo the same process.
It stays up for ages and to be honest the one thing MNK does best in FLs is 1) tanking with riddle by attracting enemy fire and 2) punish/delete people by punting them into your team and stunning/meteodriving them there. PR is just a nice bonus you get if you get to hit people in engagements enough until it's up, which isn't that hard to do. If you're mobile enough, go in, hit people, go out, go back in, hit more people with the next riddle up, then go out, etc, then PR will be up in no time.