Strongest class/job lore wise?

[Velox]

WHM and BLM are dangerous in that, through practice of their arts, they are borrowing aether from the planet to cast their spells. Using too much aether bleeds the land dry and leads to calamities. Primals feed off the land's Aether supply as well to exist, and we have to put them down because if the same risk. This is why the use of White and Black magic was deemed forbidden, it destroyed the entire world once.

In essence, every WHM and BLM is a mini-primal, sucking aether from the environment to make their flashy, lag-inducing spells.