grens LMG's and Volks shreks are absolutely necessary for Ost and OKW respectively; Soviets can live with demo's that are limited to world objects.
Cool, except they are not. There is nothing that volkshrecks do that puppchen/puma/JP4 wouldn't do. Same for grens and MG42s and snipers. Unless what you want to do is your fav and only playstyle mr.Blobberino.
I can say as well that "demos are absolutely necessary for sov to fight late game superior axis inf without the need to spam elite infantry".