What I'm saying is
If Jobs = Playstyle (Paladin = Tank, Warrior = DD, etc)
Playstyles should not be restricted to One Weapon. And One weapon should not be restricted to one playstyle.
Strip the names away and just look at the core.
Sword / Tank
Spear / Tank
Staff / Healer
Club / Healer
Dagger / DD
Great Axe / DD
Your Weapon Class is only your weapon, Just because you change your playstyle doesn't mean you forget how to use your favorite weapon.