Relic did. This is how OST's tech structure was originally organised. It's why unlocking T3 results in the voice line "medium armour and rocket artillery is now available."
You could restructure OST's tech to work like this, but it would be more than simply swapping the units. You'd need to rework all the teching costs so T4 comes out earlier. You'd then have to completely rebalance T3 around its own earlier timing. That'd mean reverting the Ostwind to its previous state and probably toning down the StuG too.
It'd be a major undertaking in fixing what isn't really broken.
Why would T3 come earlier, T4 would come earlier(technically). But going from T3 then to a T4 would be dangerous.
Simply put place T3 have no workhorse but have stug + pstwind with werfer for support, or wait a little bit for P4 but don't have cheap follow ups.
Ost T3 would kinda work like Sov T4 instead weaker/OKW mechanized but stronger.
Ost T4 would now be like the schwere but have slightly weaker units and siege tool rather than a TD - the ober's(but pg's kinda fill that hole).
as T3 & T4 is now,
T3: 90f + 15f
T4: 90f + 25f + 25f
we could make it,
T3: 50f + 55f
T4: 50f + 25f + 40f
we could also make the Panther and Brum cost more like 15 fuel each. So Panther would be 200f and Brum would be 170f.
So A panzer 4 rush would go up by 10 fuel and Panther/Brum rush would be come earlier by 15 fuel(maybe horribly wrong with my math here).
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