That doesn't seem all that hard to accomplish to me. If you're aiming for optimal, you're going to use a lot of sets. For example, for my Dragoon, I have the following sets: Idle (Regen), Idle (Refresh, for /mage), Idle (DT), Engaged (Standard STP), Engaged (Light Accuracy), Engaged (Heavy Acc), Engaged (DT), Engaged (DT/Acc), Jump/High Jump, Spirit/Soul Jump, Spirit Link, Healing Breath trigger (master HP+ for earlier trigger + Vishap Armet +1), Healing Breath potency, Stardiver, Drakesbane, Camlann's, and the "other WS" category... and this isn't including my sets for when Aftermath is up, which causes my gear to vary quite a bit in my various engaged sets. I'm probably even missing a handful. Dragoon is a rather simple job compared to some others; can you imagine trying this for Blue Mage or Red Mage, for example?