[Jammin]

you dont even need the jumppack at all to make the jump

Well that's technically true, I don't think having to hit the perfect crouch jump to traverse a main part of a map is conducive to a novice players involvement and enjoyment.
Plus, I believe the game mode centers around finding out who is traitors and killing them, not hoping to crouch jump across a large gap and hope you make it. 
I'm not asking for the ability to fly, I'm just asking that you don't have to know video game parkour in order to play certain maps.