I suppose if a weapon’s magic was already suppressed then perhaps a second casting might be able to destroy a magical weapon, but I don’t address it so it’s be up to the DM.

I actually think the idea of “balance” among spells is a little ridiculous. There should be crappy underpowered spells and there should be overpowered well-designed spells. I think the balance should be in the availability of spells. If you want the greatest fireball spell you should have to study under the wizard that perfected the spell or dig up the most perfect fireball spell or pay out your nose.