It is true there was a lot of material aid provided to the USSR by the other Allies in WWII. This was particularly critical with regards to supplies and supply chains like you said. There's even an anecdote about how an US General asked Stalin which of the fine weapons produced by the US he wanted. I think Stalin said something like that he wanted all the trucks they could spare to his amazement.
Russia basically tried every single tank design done in the interbellum. When they designed the T-34 and KV-1 it had lessons learned from all of these designs plus the actual war experience from the Battle of Khalin Gol, the Spanish Civil War, and the War with Finland, like you guys said. So the emphasis on the diesel engines because of fires. Heavier armor and more firepower. More mobility. Yes I agree, like I said on my original post too, a lot of it was based on Western licensed production or Western derived designs. This is particularly obvious in engine design and the Christie suspension (which was actually not used by the US Army but got licensed to Great Britain and the USSR). Soviet aircraft production also had several issues in the initial years because aluminum supplies were rather scarce. A lot of the hydropower stations to generate electricity for aluminum production were bombed. So the Russians put an emphasis on lightweight fighters, twin engine bombers, and ground attack aircraft since they had limited resources to spare. At this they proved quite capable.
Still they did manage to make their own unique integrated high-quality designs which even proved capable of rapid evolution as the requirements increased as the war advanced. The T-34 and KV-1 actually had great specs when they came out and scared the hell out of the Germans during Operation Barbarossa. It was only organizational and production issues that decreased their impact. They eventually needed redesigns to compensate, Germans improved their tank armor and gun e.g. in the Tiger. Yet USSR engineers proved capable of rapid evolution into the T-34-85 and the IS-2 which were even usable in the Korean War years later.
There is no doubt Western allied support was critical in making sure the USSR had better chances of winning the war. But even Britain, which was "the" major power at the onset of WWII, needed supplies from the US and Canada while they had their own infrastructure bombed by the Luftwaffe. So it's not like this was a problem specific to the USSR alone among the allies.