[Joseph Jostar]

I'm still personally for the idea of some sort of penalty for overwriting an enchant early, like using a conflicting elemental causing damage to yourself, or even some kind of status infliction for overwriting one element with another (+damage taken, temporarily both weaknesses, etc.) to reflect the conflict and make it so that switching your element up isn't a free out. (Which could also make room for a 'Dispel' Enchant subpath or something to counteract that a bit, but I'm rambling a bit by this point.)

Actually, if the weakness thing is the major reason, having both weaknesses if you overwrite-enchant sounds like a good shot, doesn't it?