Political Memes

equipment that is easy to mass produce; which is what beat the Germans.

Over simplification. That was the Soviet strategy sure. Almost no changes were allowed to Soviet tank design unless in lowered cost or simplified manufacture. But that wasn't British or American doctrine and they often had much more advanced equipment in key fields like radar and aircraft than their adversaries. I like your first point better though: the allies won thru superior manufacturing capacity. The Americans were a juggernaut and the Soviets managed to move most of their factories east beyond the reach of German aircraft while Germany itself got pummeled by bombing campaigns.