Jump should just use movement, imo. They could approximate the 5e rules AND make the athletics skill actually useful by giving you a distance that you can just jump as part of your movement equal to your strength score (or str score + proficiency if you have athletics). Those are you baselines for those things based on your stats, and then items/abilities, etc... modify them further. Jump spell becomes a modifier, like x1.5 or x2 or something. It would have to also modify your tolerance for falling, but that seems fairly balanced to me. It'd be even nicer if the Pathing could just jump effortlessly for PC's with the jump distance needed. Then your spells would feel a lot more useful and the ability scores would seem like they matter for more than just attack and damage.
I'd appreciate them adding in proficiency bonus for their jump distance calculation with athletics proficiency. It's not really spelled out in the PHB, but it does mention Str (Athletics) checks to increase jump distance (it just doesn't give a formula for it like in earlier editions).
I'd like to see jump not be tied to disengage, and I'd like to see disengage cost an action (same for Hide, so that the Rogue's cunning action really stands out).
