I think this a needed buff for several reasons.
1.Gives them the ability to destory fortification quicker
2.Gives them the choice of having 3 smokes and a grenade/ 3 grenades and 2 smokes/ or 5 smokes. This will make the medic class play differently thanks to each setup
3. Grenade rifle (IMO) does not belong in the assault class. With the dynamite, PIAT, Panzer, and AT mines, I think a greanade launcher is unneccsary.
This would be a great buff to the medic class AND we would no longer need buffs to the smgs. I think all the medic class needs now is a new weapon class( Carbines not DMRS)