On the magical weapon front - I think that should be an action surge sort of thing - something that takes superhuman effort to do, but can’t be always on until after, say, 15th level. There should remain a benefit for picking up a magic weapon, but the martials shouldn’t feel shut down or useless for lack of one.
I think Force spells should go back to having HP, damage resistance to all attack types (save force & poison, having immunity) and a damage threshold. Tough to take down, but not the utter show stoppers they are now.
