Its arguable that a significant part of the defeat of the Germans on the Eastern Front was due to the Germans loving to over-engineer things. Especially tanks. And had an obsession with having big guns on them. To the point they could only go 5-10 mph and if anything broke on it it would have to go back to Germany because the design was so weird/complex. Cant remember if it was the Rat or not, but there was even a tank where if you wanted to shoot the cannon somebody had to get out and unbolt it from the hull because it was so big it made it unwieldy to drive.
Meanwhile Soviets just said “Haha T-34 factory go brrrr”, and was easy enough to make and use that there are stories of workers completing the tanks and driving them straight to the front. Illiterate farmer Vasily from the Urals could help weld on parts and then go take part in the fight.