You mean logically or mechanically? Junkrat's mine is meant to also be a device for movement. Pharah's self rocket damage is meant to dissuade sloppy close encounters because it's her main weapon. You can "rocketjump" with her E in any case.
Are you actually using your rockets to jump, Quake style? Cuz that's not how you do that. She has an ability that launches her into the air, and can use concussive blast in a pinch.
oh, ofc I know she can launch herself in the air. But when I heard people say "rocket jump" with pharah I excepted them to do it quake/tf2 style, I didn't know they meant it as pressing the E button!