victory cities are just for new players, I never played with VCs, and since Revised I’d never achieved the minimum nr. of VCs in revised/AA42/AA50. It has always been up to me or my opponent to concede, then the game is over.
If you are saying that the Allies are landing Western Europe heavily, even reinforcing with fighters when Germany can reliably kill their beachhead, then it’s probably a bad idea unless the Allies are so far behind they need Germany to get diced. I don’t go heavily into Western Europe unless I can hold it for the rest of the game or I can hold it for a turn and have enough transports that I can pull out most of my units before Germany overwhelms them.