Mostly because the Allies took over and invested a bunch of money into them developing in ways that didn't involve fascism.
The Marshall Plan was a real thing.
My father also told me that before the Americans decided on the Marshall Plan, they considered other plans (also named for American generals IIRC) one of which involved sterilizing all German men.
The Marshall Plan was a real thing. <
So damned funny!!8-)) The phrase "Grasping defeat from the jaws of victory!" comes to mind.
But yeah, transporting those old machines back to France was probably a waste of Paris's time.