Enchanting system is horrible in this game.

[Liniont]

While the Item team realizes you’d like to see more uses for materia in amplifying item stats, they clarified that there are currently no plans to change the stat caps. The way the system works, each item follows a hierarchy and adding materia to any item, while improving its stats, will not change it to an item above its level.

What about materia that add elemental effects or auras and materia that enhance skills like in diablo 3 where instead of a Black Mage Using Fire and only throwing one ball the black mage does a rapid fire of 3 balls, it does the same damage it just looks and acts different or a White Mages Medica with a special materia Medica will have the ability to be casted on a selected party member instead of the WHM or it causes an AOE puddle of pure glowing water under the WHM that other party members can run on top of to get a "healing over time" effect while in the puddle.