i don't understand where's your problem, ost now gets T2 faster and i think at lower price, battle phases unlocks are cheaper while Tiers are more expensive which is good because before patch, ostheer could deploy t3 tanks much faster, now it focuses on earlier infantry battles.
Soviet tech changes are good IMO, T3 is now viable because it has AI unit, AT unit and halftrack, cost is not high so they can be deployed quickly, some strats now focuses on fast fuel harrass so like M5 can be build at 7 min which is OP.
I dont get why USA changes are bad, major is 30 fuel more expensive which is usually less than 2 minutes to get that, that change was necessary because USA could get Sherman at 10-12 mins