Which is why I helped back Level Up 2 years ago. I wanted a little more crunch in a 5e-like RPGAs above, I think simpler is generally better, which is counterintuitive as I invested in an "advanced" version.
Cycling back to the OP, using movement would be tricky (are faster creatures better at maneuvers, or heavily armored beings worse in that they can do less, etc.),
And what if your character's race has an additional movement type such as an Aaracokra's ability to Fly? In earlier editions of D&D, Flight had things like maneuverability and several flight-related feats tied to it.