Or, in short, how the job feels to play.
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You can say that you don't like the job or the specific skill. You cannot say, however, that MNK "has problems" because it feels weird having a slower gcd for a few seconds. They're not going to change RoF because some people said they prefer a fast mnk. Just like they didn't change brd in 3.x when people complained about bowmage. And the change there was way more drastic.
How the job is played does not equate to how the job feels to play. You basically had to keep that ability up on BRD full-time. Here, we've been told, MNK is basically at the speed cap we want for DPS jobs and can't go any further. So for 20 seconds, we punch slightly faster than base GCD without GL. It is not require full-time to reach optimal potential for the job.