Dexterity, Mind, and Intelligence materia
The following materia have an actual use:
Strength: Can be melded on Tank accessories, since Tank DPS is based on Strength.
Vitality: Can be melded on Tank/DPS/Healer accessories to boost their HP for doing high-end raids at minimum ilvls
Dexterity/Mind/Intelligence: These stats only governs potency for their respective jobs, but they cannot be melded on their respective Jobs' accessories, because these accessories already capped for these stats (e.g., DEX on Scouting gear, MND on Healing gear). Furthermore, new accessories since 4.0 are Job Locked, so it isn't as if Healers could equip Fending accessories and Meld MND onto them like prior to 4.0. So I ask you, what is the point of having INT/DEX/MND materia if they have no actual useful purpose like VIT (all jobs benefit from VIT) and STR (only for Tanks, since tanks use it for DPS too).