If memory serves me right, the T-34's turret was a casting which they didn't machine on the outside - and only on the inside where fittings had to go. It was a philosophy the Russians applied to most of their weapons - they'd only last a short time before being destroyed/lost/beyond repair, so don't waste time giving then a nice finish.Which I believe was over complicated and engineered and slow to produce compared to the T34, plus the German's almost fetish for competing companies to produce weapons systems, rather than mass produce systems that worked.
The Germans did the reverse. When Milch finally got his hands on aircraft production, one of the first things he did was stop them putting beautifully hand-stitched leather seats in aircraft, replacing them with cheaper mass produced alternatives. Then he set about simplifying and standardising aircraft production. The Ju 88 used some 4,000 different sizes of bolt; each the precise size for the location it was in. Milch simplified that to a few hundred. A 25 mm long bolt will do the same job as a 20 mm long one, as long as the extra length doesn't foul anything.
Although the Germans ramped up their production in the closing years of the war, it was stupidity like hand stitched leather seats and multiplicities of bolt sizes that let the Russians greatly outproduce them in the middle years of the war.