Why can RDM use H2H weapons?

[Mirage]

Yeah, but if they do that, then they'd have to do that for Staff too! And we know Red Mage isn't getting taken off of Staff, so then we'd have to face the reality of melee Red Mages with Staves!

Red mages actually swinging a staff? What an abomination! May Altana purge the lands of such a monstrosity.