SE doesn't need to do anything to protect people here. You already have to click enough times to go through it. I don't need yet another confirmation box on top of what already exists.

You realize melding the wrong materia doesn't ruin an item right? You can talk to Mutamix in central thanalan to have your item wiped of materia.

Also, whenever someone is doing melding requests, I always ask them if they're sure if i think they're making a mistake. I'd honestly blame the person doing your melds for not catching an obvious error before confirming.

Also, its worth pointing out to the OP: You can still max the potential of that item even without wping the materia- You can't add any CP, and you can cap both control and craftsmanship with 3 materia. the remaining two slots can have whatever, because nothing else affects crafting.