random bit about pyro/warfare sparks, which don't really have anything to do with the question

It was to sell the idea of the combo; it's nice for the investment on other skill trees to have more than one usage; it the player went for those spells but didn't do Pyro+Aero, I doubt it would be a satisfying build since Aero isn't as potent as Pyro in melee combat, and the tradeoff of high ground bonus may discourage the user to go to the frontline, rendering the whole tactic less preferable

The last two repetition were to emphasize that they work really well together, almost like an intentional design. I always wonder why the presets don't have these two. Even one of the relic set is for one of the two