I love this misconception so much.
For every 4 P4s you get 5 T34/76.
That is hardly spammable.
80 fuel stug is spammable, 80 fuel wolverine is spammable, 70 fuel puma is spammable, 100 fuel T34 is not.
How often you get 3-5 PzIV? I guess never.
How often 3-5T34/76? I guess sometimes.
You dont consider meta. You only look at dry numbers. Those numbers say that it's pointless to tech and get T70+T34. It's better to wait for IS2 or ISU because in fact they will be cheaper.
But those numbers dont say anything about putting pressure with vehicles. According to them it's better to wait but according to meta, T70+T34 and later IS2 is better option.
Ostheer is all about getting Tiger or Elephant.
Soviets can rely on T34 because of doctrines which can negate AT guns.
You save 50MP and 25F on each T34 when compare to Pz4.
It's huge amount of resources. It's like T34 and free unlock of AT nades or molotovs.
3 Pz4 are not issue. You can negate ZiS guns or Cons as well as soviets can.
Soviets can to it thanks to precision strike and call in strikes.
Stug is more spammable but it's so easy to counter, you dont get any profits. T34 with right doctrine is not so easy.