Remathilis
Legend
It doesn't fix the biggest disparity in mundane and magic; out of combat magic.Or not. It would be relatively easy to balance out spellcasters if you really wanted to. Here, I'll show you. Two changes.
1. No cantrips. Every spell requires a slot, period. That way, martials really are not just better in combat, but a LOT better in combat. It also means that the utility cantrips also require those precious resources. Spellcasters still get the "Gee, whiz!" spells, but they requires resources and planning.
2. All spells go last in the round, and any caster hit during a round doesn't get the spell off. I know! That would massively balance the game. Sure you could tinker with this a little. You could have casters get a save (with disadvantage if there's a lot of damage, etc.). Or you could have a select group of spells that don't make you go last (like the "Power Word" spells). Tinker at the edges. But it would again mean that spellcasting is a specific choice in combat.
Would this radically reshape the game as we know it? Yes. Would a lot of people be howling? Certainly.
Would it restore balance in the Force? I think so.
A fighter and a wizard are pretty matched in combat. It's out of combat when a wizard can go invisible, teleport across Chasms, or charm a guard when the mundanes have no match. Returning to the example, Luke and Han could probably have slaughtered the same number of ewoks, but only one of them is telekinetically lifting Threepio to make him look like a god and thus forcing them to let the heroes go.