PA has limited offensive capability once in enemy terrain and cannot operate much farther from main bases. In relation, Wehrmacht, Soviets, Americans and even Chinese can operate much farther from their bases as seen in WW2 and afterwards till now.
All the forces you mentioned have in-house manufacturing capability, where as PA lags behind, having one major manufacturing factory, designs/components which have been modified from original to suit own needs and the production numbers are very low. Back in 1930s and 1940s, Germany had own trucks, tanks, APCs, and other vehicles. Pakistan still imports weapon systems, which is good and bad, both. Then ammunition production capacity of PA is very low, there is one major facility only.
The formation numbers of PA are also very low. The total PA formations today, stood for one WW2 field Army (American/German/Soviet), of 22-25 Divisions and all of those countries had many field armies in WW2, e.g Germany alone had 25 or so field armies. PA lacks a dedicated Airborne/Air Assault Division sized regular formation (not SF). The low numbers of helicopters in PA also hampers operations when Vietnam war is considered. along with subsequent wars
PA has long range surface to surface missiles and tanks (and other armored vehicles) with better armor, better gun, better reach than older armies, but quantity wise, logistics wise, production capacity wise, PA is far behind.
