Why do Ninja and Monk use different gear?

[MaethusXion]

Gonna be funny in 4.0...

Tank- PLD/WAR/DRK
Healer- WHM/SCH/AST
Tanklike- DRG/SAM?
STR Melee- MNK/SAM?
DEX Melee- NIN/RDM?
INT Melee?- RDM?
DEX Ranged- BRD/MCH
Caster- SMN/BLM

Really though they need to better consolidate the DPS drops, since DEX is useless to DRG/MNK and STR useless to NIN/BRD/MCH, they technically could do just 4 sets (Tank, Healer, Caster, PhysicalDPS)... aside from oddball DRG and it's Phys/Mag defenses so different...

[Yasminou]

Gonna be funny in 4.0...

Tank- PLD/WAR/DRK
Healer- WHM/SCH/AST
Tanklike- DRG/SAM?
STR Melee- MNK/SAM?
DEX Melee- NIN/RDM?
INT Melee?- RDM?
DEX Ranged- BRD/MCH
Caster- SMN/BLM

Really though they need to better consolidate the DPS drops, since DEX is useless to DRG/MNK and STR useless to NIN/BRD/MCH, they technically could do just 4 sets (Tank, Healer, Caster, PhysicalDPS)... aside from oddball DRG and it's Phys/Mag defenses so different...

As MCH who received all the BRD stuff and share the new stuff with them, I think, in 4.0, we should see new melee dd sharing all their gear with either DRG, or MNK (I rather not NIN since as stated above, there are already 3 jobs who can roll need on DEX accessories).