But I guess I see your point when combined with osttruppen, but this doctrine will still have you rely on grens, so barring that you lost them wouldn't it almost always be better to spend your 45 munis on upgrading them and keeping the pgrens for mid range and close up wipes or as tank hunters?
PG is very tough guys, when they have vet3 they will be annihilate all infantry. In fact g43 give you long hand, if enemy soldiers don't want move to your PG, they will be shoted by g43, but if they move closer they will be beated with STG and g43 (g43 is not bad in close combat too, not so brilliant as STG but still potient). BUt if you PG only with STG then YOU need to move closer to enemy that is more risky. My start for such strategy was 2 MG42 and 2 engineers, then fast T2 and PG. Grenadiers only need for their faust and long range mg42 but if you have osttrupens and PG with g43 why you need grenadiers? PG have the same weakness as stormtroopes of soviets - small range of fire, but if ST have smoke grenades to move closer to enemy, PG don't have such usefull tool. This why g43 very good choice for them.