Two handed jobs can only use one, but only need one, DW jobs rely on two weapons to do the job, if you have a Delve weapon in one hand that's great, but your other hand can not, they are R/EX and the chances of having boss drops are laughable right now, which means your sitting on Skirmish or RME weapons as your best so far as I know. That means you will be main handing one weapon with twice as much damage as your offhand weapon most likely, which is poor and lowers your damage. The point here being that two handed jobs only need a single weapon so that's fine for them but DW jobs need two, its a simple concept, and a drawback on DW jobs that hinders them once again.
