Dragonriding’s design is to go fast. It’s why it exists complimentary to TBC Flight, whose design is to have perfect precision.
Being bad at Dragonriding should just mean you don’t get to fly at Dragonriding speeds. Not that you don’t get to fly at all. This design does not get invalidated by having TBC Flight alongside it. You still have to re-ground to swap mounts anyway to try Dragonriding again.