I'm all for materia melding. It does help greatly. But I do understand that we are 2 months (less than 2 for EA) out from the next expansion, so it probably doesn't matter as much now. Would I cringe to see someone in full 530 gear with 0 melds? Absolutely. There's no good excuse for it. Even so, I would simply let them go about their business. It's their choice, for better or worse. Chances are someone, somewhere will point it out to them. They will either care or not give a crap.