Oh god no. Don't lock it in place once fighting happens. That's what they did to hit the dirt, which is now literally useless.
I'll accept only setting up out of combat, but not being able to even sluggishly dodge a grenade is pretty much the end of any infantry ability when fighting Ost. Remember, rifle grenades have a range of approximately a thousand nautical miles.
Or less sarcastically, once your infantry spots one another to start firing, the grens are basically in rifle nade range already.
It used to work like that 1 or 2 patches ago and it was still viable, just not a broken I-win button, keep in mind that ost is always starved, you can waste a rifle nade on 1 maybe 2 squads, not 4 or 5, and then with what are you going to faust the inevitable double or triple sherman rushing & crushing your infantry?