i agree with both of the points ! if you rocketjump, with 2 ammo left if you miss you're dead.
And on the overall, 3 rocekts = you can't shoot recklessly at enemies and need to make them bounce in the air a first time to have a secured other shot !

You meet a bunch of enemies after a rocket jump => ammo left: 2
Good luck in 2Fort.

black box is a decent weapon that is balanced enough, the ability to heal you is a big upside of course, but with only 3 rockets, you gotta be more careful with the shots, if kept on firing aimlessly, you'll die quickly, so there is that