Well, something to keep in mind is that both tank and melee gear will have strength and vit. Tank gear typically has far higher defense though, and can only be rquipped by gla/mrd/pld/war. A fair amount of gear has lnc/drg on it as well, and I believe the system gets finicky here. That gear is typically the best for lnc/drg, but it's also sometimes the only tanky set that isn't outdated. So, the system does still need some work there.