I'm pretty good at jumping also, but I think with hale flying everywhere, no effect with the escape plan, and just in general things like that, this would be balanced. If you miss your Market Gardener, if you don't jump away fast enough, you could easily be dead. And if Rocket Jumper was still disabled, you could also run out of health quickly if there's not a medic in sight, due to the lack of HP on Arena/VSH maps.