Since there is seemingly a Lore-Based explanation for nearly game mechanic....

[JMadFour]

If you want a lore reason, probably most combat skills Aether in some form or another, even the non DoM ones. Infact MNK for example is based on the channeling of Aether within ones own body.

this is what I am looking for.

basically, channeling Aether into our Weapons, for example?