Yes they were underpowered because they were not comparable, it was always better to build civilian IC trade then it was to build synthetics.
Civilian IC is more flexible then Synthetics and that's a huge advantage (also they give +8 resources on a trade) so reducing Synthetics production would make them really bad to build. That was what my original response was about, it was suggested that the resources they provide should be reduced and that would make Synthetics something you would only ever build if you were truly desperate.
I disagree. Yes, civilian industry is better. It should be better, to force countries to
compete for resources that are on the map! If synthetics are comparable, why would anyone expand?
Germany&Japan&Italy have zero incentive to expand in the scenario. The game shouldn`t mirror HOI3 in this regard, where Germany, Japan, Italy could just sit on their hands, and gain 200-300% increase of IC because USA&SU and GB and France would happily trade all the resources they need.
Germany and Japan should be desperate for Oil as soon as they start hostilities. From 1939 till 1945(or, till they get to large oil fields), is their time when synthetics are the
only additional source of oil. Considering USA and SU oil production, it is almost mandatory for Axis to build synthetics if they want to match Allied capacity to build tanks, planes and ships.
You didn`t provide me with the answer, what is the use of civilian IC, if you can`t trade resources that you need for it? Is it still better than synthetics in the scenario?