FrozenNorth
Hero
I’m not sure if even magic items narrow the martial caster/gap.I think feats favor casters. Multiclassing definitely does.
Magic items are a bit iffy. Things like winged boots tend to help martials more. But when it comes to Wands of magic missile and fireball they may actually outdo magic weapons.
If previously the wizard was casting fly but now he is using that slot offensively, the net result is that he has more slots.
Kind of like the cleric is overpowered on paper, but often feels less overpowered in practice, because the slots used to heal means they can’t use the Spiritual Weapon/Spiritual Guardians combo every fight.