The main difference is that rifle nades are free, that is why you will see more squads wiped by them. Otherwise it would be the same. Grenades and rifle nades should be a tactical tool to dislogde squads from cover/garrisons and win engagements, not a game winner squad wiper. I think one of the ways this could be achieved would be increasing the aoe and reducing the damage.
Free of tech, but costly in a munitions-heavy faction. And it's not like the USF/UKF teching is that incredibly expensive either, with decent map control it will delay tech/vehicles by about 30-60 seconds.
While I could agree that grenades in general could be tweaked to deal damage / dislodge rather than wiping, I do not agree with this thread's trend to make the problem about rifle grenades in particular and ignoring the similar wiping potential of Allied grenades.