That is doctrinal and requires a lot of resources. Pwerfer in T3 would mean pwerfer every game in combination with stug spam way before calliop arrives.
It's doctrinal but that's not the case since it's problably most picked USF doctrine and definetly brain-less doctrine.
And what resources it requires? It costs less than T4 PzWerfer
For me case is simple.
None map should favour only long range units or only mobile units or static units or close range units etc... etc.. etc. (RIP new city maps).
Perfect example is Angoville.
Amazing map.
Divided almost perfectly between wide, open spaces and smaller ones with buildings. Great map.
Second map is Arnhem. Middle is really cluster, great for flanking, and mid-close range units while flanks remain open.
Each map needs some balance between sections but none of them should give advantage.
Firstly I would add all units to match-stats casue Pit, Bofors and 17P despite being units, they are not counted in match stats
(their damage is counted in "total damage" but not for unit itself; even okw flak has its own match stats).
Then I would add damage made by abilities, mines, demos.