the performance of pgrens is a completely different topic, dont you think? And I disagree with Obers coming later, at 3 CP you should have the t4 already built unless you went for mechanized, in which case t4 isnt the best idea anyway
I mean in 1v1, you could be at 8 CPs before T4 was up. That allowed for the ostwind callin meta back post june 2016 patch. 3 CPs is like the 5-6 minute mark roughly. Yes pgrens are heavily different because of how the squad works.