Well, you could love this but the French will still have a sizable force in Southern France- they could go to Normandy and the Brits could land there- perhaps land a bunch of fighters there. Or stay in Southern France and the Brits land units there from Egypt/Malta/etc.
I agree. I don’t think allowing this type of army to stay alive is a very good idea. I would take all the german forces available to try and wipe them out asap. Moving them into southern france would make that difficult to do on G1. S France could have 10 inf, 3 art, 1 armor, 2 fighters, 1 AA gun. (possibly more powerful units with a different purchase). Germany could only get 4 mech, 3 tanks, 4 fighter, 4 tacs, 2 strat. The odds are only 62% that germany wins with one ground unit to take the land (63% otherwise). That also takes away most of the attacks, if not all, on the Royal Navy. Tough spot for germany to start at.