1) Soviet Union couldn't just keep feeding men into the grinder. They already took enough men from the fields to produce a famine in '46. Take enough men and the country collapses due to famine and can't keep up the war effort. As it is they would have been in big trouble without imports letting them displace entire war industries like aluminum and locomotives.
Less men= less farmers required, it's positive feedback. And while neither country had trouble with the old, young and disabled, unlike the Germans, Soviets also had no trouble throwing women into the same grinder. In general, if you have to ask "would Stalin stop at this?" the answer is always "no".
2) The Germans had a bigger population then 80 million to draw on. Romania alone supplied enough troops to more then offset a years losess on the eastern front.
Romania had about 14 million people to draw on. Assuming the losses are 2:1, that's still a drop in the bucket.
And the Soviets didn't have 200 million men they could actually draw from. Defending Russia from 500 miles in friendly territory meant that almost half the population of the country was in occupied territory. The Soviets evacuated young men to an extent but couldn't get everyone.
Not everyone, but neither was it half. let's meet in the middle and say 150 million warm bodies.
The Soviets desperately needed the offensives of '43 and '44 because that gave them access to new populations to recruit. But those offensives couldn't have been launched if the Soviets didn't have the upper hand first.
Yes. And getting the upper hand against Germany meant playing the waiting game. Germany might have siezed stores of food, but it was operating in the red on everything. It's supply of fuel were decreasing, it's supply of metals and rare earths was decreasing, it's supply of goodwill with the occupied people was decreasing (by 1945 many areas would be pissed enough to be in open revolt. Deliberately hastening the advent of Soviet occupation. Can you guess how pissed off you have to be to welcome
that?), it's supply of food was decreasing. And it's supply if meat for the grinder was decreasing too.
Outdated doesn't begin to describe it. http://en.wikipedia.org/wiki/T-26 <- not even their oldest common tank but the most common one they had.
You confuse 2 concepts. Soviets didn't have less good tanks, they had overwhelmingly many tanks of varying quality. And yes, most of them were garbage, but event a single T-26 will cause problems to an infantry squad. And soviets had 20'000 of them. compared to about 3.5 thousand armored fighting vehicles that Germans had. Entirely aside from their vast array of old tanks, they had about 1:1 parity in medium tanks (depending on definitions) and a superiority in heavy ones. Let's be honest, NO German tank was heavy in 1941. Not one. It would be another year before Tigers would start arriving, and almost 2 years for Panthers. The best Germany could do was captured KV tanks, the same ones you so easily discount.