I guess the main argument against introducing French rides in general, is that they would have limited use in both the MA and scenarios. Any French ride is only likely to be competitive in the early war MA, since their was no weapons development in France after 1940. Similarly the only scenarios you can run with them is the Battle of France and maybe Operation Torch.
If you were HTC planning a 1940 era addition to the game, a German, Italian or British ride would make more sense. There would probably be more scenarios it could be used in for a start (Battle of Britain, Desert war, Balkans, Greece, early Russian etc.) Many of these rides might have uprated 1941 and later versions that could be added to the game as well.