But that combination is controlled by 2 separate players and only available in team games, not the same player.
USF was designed with Crews and M36's because they had no Heavy Tank. In my opinion, to add a Heavy Tank, they would need to disable those features which made up for their lack of one. Also, the M36 was originally doctrinal, which meant it wasn't planned to be used with any potential Heavy Tanks in the first place.
1. IS2+SU85 and King Tiger+JPIV are controlled by 1 player and I belive they are superior to Pershing+Jackson.
PzWefer was in T3 but for long long time we have it in T4. Point is, if something was planned it does not mean that it will be implemented.
OKW was designed with resources penalty. But in exchange, they have vet 5, resoursec conversion, non-doc King Tiger and forward bases able to hold sector by itself, not to mention free repairs, free healing, cheap tech, cheap upgrades etc.
USF were designed without heavy tank. In exchange they have tanks' crews. I belive OKW's advatanges are way greater than crew, which is used only to repairs tanks - what RE could do easily because of low HP. Tho I cannot see how crew can be considered as a something extra because there is no heavy. OKW has penalty but you can lock down sector or transfer resources to nullify it somehow. How USF is supposed to nullify lack of heavy?
And the most important thing, USF do nt have anything expcet Jackson to inflict damage in late game. I sad that few pages ago. All factions have plenty units with penetration 200+ yet USF have only M36.
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About doctrine you have posted, well you assume that at some point player will always call for Pershing which is wrong assumption. In the end you might avoid Pershing but you still cannot use M36 or crew. It would way more better if this "battle ready" was part of M26 call in so the crews are disabled only when M26 hits the field, not before (tho I still think they should not).
So if I did not use Pershing, this doctrine would not provide me any advatange.