We want a knockback because it is a very game changing mechanic. No marauder wants a knockback for dps purposes. We want a knockback so we can get free kills on voidstar when people cross the bridge, we want a knockback so we can make use of the environment in huttball and get some amusement out of the slime pit/fire, we want a knockback for more survivability in huttball...many a ranged have saved themselves from dying to me by knocking me down out of their LOS long enough for them to heal up and/or run away, we want a knockback so we can combine it with our vanish to ensure we can escape even if there are no LOS opportunities available. think of the big picture and not just "oh we are melee so having a knockback is dumb because that puts them out of our dps range"