Just like you said, even in one class each character is very diferent from another, this new ability doesnt affect much scientist, most of time foot soldier is rushing or on a roof when both scientist cant reach him
The "sniper" class both pirate and cactus when someone sees you and if u get hit u have 2 options to do while your hp recovers, go to another place or use the drone while you heal, snipers dont need aid kit of 15hp or poison-fire heal.. thats the least class who would need aside from tanks
Foot soldier would use it after striking someone, just use the aid kit after killing someone , cut the poison or have a minor heal to stand a chance against other foe and keep going forward, thats where he exploits more his class, going forward with rocket leap, not in back sniping like you said it would be useful