The more important practical sub-questions are:
- How to pressure the Eastern Front while still defending against massive Allies.
- How early or late to leave France to swapping.
- Balancing with the demands of Africa (Too often I’ve lost in Africa from either side ;-))
For 1) once the UK and US transport fleets grow, clear the Axis counterpart and get well positioned, they effectively “multiply” the threat by each area where the threat is applied, making a total defense of everything pointless.
For instance, a Baltic fleet threatens WEU, GER, EEU, KAR of which Germany can stay in, say, only GER and KAR.
An US fleet in Med threatens WEU, SEU, BALK etc., of which only SEU is almost mandatory to hold.
Dividing UK and US threats into N and S reduces their interference in same areas as “multi-attackers disadvantage”.
What I don’t know if how a not-very-rich Germany can stop UK(+US) flow to Archangel then Moscow if they want that, instead of the Norway build-up.