5 Pgrens? Where do you get the MP? Then who was capturing points and gaining map control during the first minutes?
Oh, sorry. I play team games. From my perspective capping is not problem. You synergy with another mates and you can use builds, which in 1v1 are not so effective.
In 1v1 your proposal can work, but total destroy team game ballance (how now make Volks with shrecks).
They come out much later, cost more and aren't "spammable" at all.
Much later? You can build tier 2 after 5 min.
Grens with lmg are now better, but we see after next patch.(LMG is now magical weapon across all sides)
I can imagine 3-4 squads PzG (squad with one shreck) as a universal blob versus all.
In CoH1 you can purchase for PzG lmg or/and PzSchreck. Much better, then now.