@Stough if the Axis captures Moscow, India, China, and the Iraq before the Allies have a major threat to capture an Axis capitol, the Germans and Japanese can focus on the long-game plan of massive air force in Europe and massive navy in the Pacific. Eventually, a slight economic advantage will allow them to force the Allies to surrender.
If you can build 5 planes/round for Germany, the mobility will make the USA/UK position untenable as they can’t afford to protect Egypt, their W European beach head(s), and their fleet. The Allies will eventually quit without needing to actually capture a final victory territory. There won’t even be a major decisive battle for play-by-email games as you can carefully avoid any significant combat which would have disadvantageous odds. A bit boring, but effective.