Nerf Now!! 1841
Theorically, Pharah can rocket jump, specially if she uses Concussive Blast which gives a bigger knockback.
However, given she has the Jump Jet and Hover, those manuevers are mostly gimmicks. Perhaps if you want to move swiftly across the map you can make some use of it but overall, you just Jump Jet and rain justice from above.
Rocket Jump? That sounds dangerous.