Why do Ninja and Monk use different gear?

[Brannigan]

we don't need 4 dex users that's why...

nin brd mch dex

drg, mnk str,

That's only three though. Gear sets right now could easily be

Tank
Healer
Ranged
Caster
Mnk/Nin
Drg

That still leaves dragoon alone, but at least monk and ninja can be combined without changing much of anything. Just make sure the next class that's introduced uses DRG gear.