Ok, you are all missing the point I think A single person with one of these "self contained" beefy bastards and 12 loaded and ready grenades, getting cover from 3 or 4 riflemen could take SASCO hill from 20 plus guys.
Shoot one for range then drop 3 or 4 into the parapet. Reload, then drop the rest on the on the hill on the way up.
That kind of fire power would be game unbalancing. Absolute destruction.
The current system makes you take time to reload even with a MGL. Loading each projectile after shooting takes time. Not having to take this time makes each trigger pull a fire adjustment and multiplying your chances to get hits on targets behind cover or speeding vehicles.
Take that to heart.