The bitflag for staff usage makes it so that the character can use staves in any class, even if the class can already use 3 weapons. Since no other character has anything similar to this, no other bitflags of the same variety exist.
I.. I can't tell if you're agreeing or disagreeing with me. I just thought that with this staff flag, we can get even closer to FE4 style Master Knights.
Nohr Noble: Swords, Tomes, Dragonstone, Stave (lol rip Hoshido Noble's usage)
Great Knight/Master of Arms: Swords, Axes, Lances, Staves (this one seems pretty bad actually, there aren't many units who could pull this off. Maybe Dwyer would like it)
Dread Fighter: Swords, Axes, Hidden Weapons, Staves (this one seems pretty broken)
sign me up for that Nohr Noble with staves action though