No mount flying?

[Dualgunner]

But why can't we fly and fight in places that allow flying, if we're able to fly without any assistance? There's some things I'm willing to suspend my beliefs on, but not being able to fly and combat when we're capable of flying without a mount is really pushing it, as if the tortoise wasn't enough (which is also just as obnoxious with the sound effects and smoke fumes)

Why isn't mounted combat a thing? Why *can't* we have aerial combat?