In campaign and PVP, the jump pack can be used to hover and shoot in the air but for some reason this is completely absent from operations. This hurts the feel of the assault class and i don't understand why this is the way it is. Could you please explain why you disabled this ability in operations?

Agree. The initial design & subsequent packs leave an impression of disdain for the assault class by the dev team. It's flight ability is muted in PvE vs how the other classes are treated, for whatever reason. Vanguard, oddly, is more mobile than assault.