Very true. Stalin was smart (and when it came to implementation: ruthless) enough to have Soviet production facilities moved into the East of the huge country, the Urals and even farther away from endangered Moscow - well out of reach of the German aggressors (see,
I told you that lack of long range bombers was dumb of the Luftwaffe!). And they were effective. Communism or not, the USSR could produce a T-34 or Stormovik by the end of the war at a fraction of the production hours (and the cost) they had to spend at the beginning of the war. In Germany, it was the other way around: Everything took longer and longer to produce, became more complicated (was either over-engineered by design or had to be over-engineered to compensate for lack of raw materials) and more expensive. One King Tiger tank took as long to produce as 10 T-34s (and probably 20 Sherman tanks).
Russia and the US kept rolling things out - with a focus on the no frills doable - en masse to continuously feed their ever-hungry war machinery while the Reich was erratically scrambling for "inventions" and "quality over quantity" - with diminishing returns as the war progressed.
At no point in its short history was the Third Reich ever equipped to sustain a protracted war. Hitler himself pushed for an early start of WW II in the late 30ies - when Germany was not yet quite ready for it, it takes longer than six years to build a military might of the size a belligerent system like the Third Reich would require -, because he believed the forecasts of economists that within only a few years Allied war preparations and production would dwarf Germany's efforts. As such
Blitzkrieg was not only a tactic, but an economic and strategic sheer necessity. And once the
Blitzkrieg successes against more or less immediate geographic neighbors were over (yet the war still going on with other opponents well out of reach of Germany's military clout), so was the Reich's long term fate sealed.
So much the better for it!
