Can you explain me how a faster T3 for soviet and +40 fuel for major as anything to do with a "hey rush Tech 4 when its even more expensive" thing ? Why spend this immense amount of fuel just for a panther when T3 tanks do the job very well ?
Sure I can.
Its not rocket science.
Sit and listen.
Soviet T3 arrives early, but it only have light vehicles, perfectly counterable by a single PaK and gren next to it.
Previously you would be "afraid" of fast T3, because there would be T34 there, its not there anymore, so soviet player needs T4. If he go T4, you'll see a delay as even if rushed, you won't see 11-12 min T34 as before-its impossible. Add to that side costs of molo or AT nade and you'll have even greater delay.
And that is with assumption there will be no T3 vehicle. Each one of them will further delay T34/Su-85/T34/85 and soviet T4 is the only logical reason you'd want to go for ost T4. After all, ostwind is all you need to counter T3.
Even if sov goes for IS-2, more CPs means more time for you to get to T4.
That being said, T3 or T4 both are valid choices, so I can't see why you are so fixated on T4.
Its still EASIER to go T2T4 for ost after the changes then it was before, because thanks to global tech increase you will not be punished with fast medium armor anymore therefore you'll have more breathing room to prepare for armor.
But again, now you have a choice, you don't need to go T4 to counter heavy armor, you don't need T4 to fight medium armor. You go there if you prefer it, not because you have to.
If you suck at unit perservation, holding out for T4 might be better for you as it provides more durabe and specialized armor while T3 being more micro intensive due to "fragility" still allows you to fight all targets.
And then they lived happily ever after.