That was one of the things that XI did very well, too. Rewards that aren't meaningful aren't rewards, and it does a lot for engagement to have players set goals for their rewards that they can accomplish. When you just hand it out like Halloween candy, it's forgotten just as fast.
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.