There is some bloat with buttons, mostly in the form of things that really don't need to be a separate button.

To go over some...

PLD, Confiteor, only usable while under Requiescat. It could easily replace Requiescat on the action bars while it's usable rather than needing it's own separate button.

SCH, Consolation, only usable while Seraph is out so it doesn't really need it's separate button and could just replace the Summon Seraph skill while she's out and about.

DRG, Mirage Dive, needs using (High) Jump first.

NIN, Dream within a Dream and Assassinate.

SAM, Third Eye and Merciful Eyes.

BRD, Wanderer's Minuet and Perfect Pitch.