"Most Soviet designs favored being cheap, hardy, and easy to maintain"
I think it was Max Hastings who pointed out in the context of WW2 that there isn't much point in having tanks that are six times better than your enemies if they have ten times as many tanks as you do!
Their battle strategy (slow the enemy down for as long as possible) and weapons were informed by their experience in WW2. At the beginning of Barbarossa the USSR had many wacky, complex vehicles and arms that were prone to breaking down, if they even worked at all.
