I know it shouldnt bother me but it does: no hammer weaps?

[Valinis]

Actually, SE removed one-hand options for BLM and WHM because a lot of BLM and WHM mains didn't want to have to collect a one-hand weapon and a shield when they could just collect one staff. Unlike Paladin weapons today, those items did not drop together.

If that was the reason they could have just made them drop together as you said. They stopped it because it meant making a staff, a wand and a shield for classes that didn't really "need" a shield like PLD. I was a BLM main in 2.0 and loved using a wand and shield, and would much rather weapon options other than staff, staff or a staff (the exact same weapon a WHM has).