It makes more historical sense than you might think, in my opinion.
Consider this: The Americans and British invested heavily into the French Resistance. Therefore, the French Resistance worked tirelessly to help the Americans and French. Furthermore, the purpose of invading France, in part, was to liberate it, not exchange a NAZI master for a Capitalist master, therefore, cities and towns were freed as the Allied units pressed into Europe. Thus, liberating the industrial and manufacturing sectors of France and letting France take them over immediately makes sense.
Think of it as a government in exile. It’s a current house rule, but it could apply to France. So no matter what the allies do, they could never take French land, only liberate it. This would highly encourage the Americans to aim for France, in my opinion.