(Long-ass post)
I will state my argument more clearly in the interest of not being misinterpreted : I am opposed
specifically to double Panzerschreck upgrade because it allows accumulating a critical mass of Schrecks (at significant cost, to be sure, but still) that have the potential to alphastrike-oneshot Allied medium tanks.
In all likelihood the Schrecks will never be reverted to one and there are much larger fish to fry at the moment in the game. What I take issue with is people using the appeal to the state of the game as it was years ago. Yes, old PGs were more expensive but it also took 3 days to drop a single model which inordinately buffed them as the assault troops, it comes from the time when veterancy was different, remember Wehrmacht vet2 defensive bonuses? Cause I do. Weapons worked differently, hell, even teching and tier placement was different. People are jumping at boogeymen here, panzergrenadiers are far more problematic as a blob of antitank alpha-strikers than they might ever be as an uber-expensive anti-infantry blob that happens to have 1 Schreck per squad.
Hell, at this point, I am not even arguing so much for a single-schreck upgrade (yes, I think it would improve the game, but maybe it's a shit opinion). But what I am saying with certainty is that any appeal to "it was tried in the Alpha and didn't work" is completely and absolutely pointless. Alpha was a COMPLETELY different game, you might as well be talking about CoH1. Different age, different game, literally nothing stands anymore.
All factions have their share of generalists and crippling specialization is OKW's shtick. Wehr does have generalists (aforementioned PzIV and even Panther to an extent). But you exaggerate the potential of all Axis units, as usual, and insist on flawed analogies, quoting similarities to Volks when it suits you (a single Schreck on an infantry unit, oh no!) while completely skirting around the obvious things that invalidate the analogy, such as the fact Volks have a forward retreat point, are far more resilient and can afford to retreat much later, and the fact Panzergrenadier blobs are a real pain in the anti-armour department and are not, and have never been, a pain in anti-infantry duty (cf. Obers with mp44 for that particular role).