I am unfamiliar with those doctrines consisting of RM mechanisms, only the OKW conversion truck and caches. Do you guys see these mechanics as not having enough tradeoff or having too much benefit?
The Opel Blitz costs 300 MP and boosts resource income from any point it is set on, so that is more or less in the same category as caches. The Luftwaffe Supply Drop costs 200 MP and brings in 150 MN or 50 FL depending on resource point on which it is dropped. The Soviet Industry boosts fuel income and vehicle production speed at the cost of manpower income passively, starting at 3 CP (IIRC) till the end of the game.
I think the only RM thing that has a good tradeoff is building cache very early; you are sacrificing an additional unit for map control for a boost later on
If we are discussing this in terms of benefit / harm to tactical and skilful play (which was the primary point of my post), I can't see how hindering unit numbers in early game can be a valid trade-off for tank spam rolling over infantry and blowing up armor in late-game.