If you want NIN to get a buff, what about MNK then?

DPS isn't everything, and with all that NIN gives your group in terms of utility and simply adding a lot of DPS, MNKs would fall way behind... It's not like MNK is much closer to DRG than NIN are (if they are even closer at all)

You're talking like everyone else is way ahead of NINs or something... while in fact, most progression groups have a NIN in their group.