While that will probably be true, it doesn't necessarily have to be, for reasons I've already pointed out like a billion times.
Just to hammer out one of the main reasons, **** is situational. In FFXI, **** is not that situational. Part of this is because jobs are so rigid and options are really limited among subjobs and merits, to the point where there are clear winners and clear losers.
But the really real reason is that enemies are not that situational. Mobs just aren't that different, don't behave all that differently, and in general do not require widely different abilities. And that is pretty much the key to ensuring diversity and balance... there can be no one best set up when many different setups are ideal in many different situations. You can see this to a small extent even in FFXI, where there are situations where a MNK, or a SAM, or a DRG is better given comparable gear... there isn't always a clear winner.
Ok, now we're going to get slash fiction of Wint x Kachi somehere... rule 34 and all...
Never confuse your inference as the listener for an implication of the speaker.
Good games are subjective like good food is subjective. You're not going to seriously tell me that there's not a psychological basis for why pizza is great and lutefisk is revolting. The thing about subjectivity is that, as subjects go, humans actually have a great deal in common.