You know how Batman dives in Arkham Knight? The mounts could do something similar to that.

Well even if not, flying doesn't feel like flying. It feels like my mount just has an additional axis to move around on. That's just very.... blah. A little more attention could have been paid to not just adding flying, but getting flying to feel right. To have weight and a sense of momentum to it, if that makes sense. Kind of like how on foot my character can accelerate and stop on a dime. It's always felt weightless and weird, like I'm a spectre just floating around, disregarding even basic physics on a whim.