I agree, we are sort of saying the same thing.
The big difference is that I get the impression from reading some of the pre-war German military journals that the Germans expected the French to be led poorly, as poorly as they were in 1870. They also expected them to fight hard, which they did but fighting hard and fighting stupid racks up huge casualty lists. This is exactly what happened. The French lost something like 500,000 casualties n the first two months of the war. They did fight stupid, there is only partial truth to the saying that "the best defense is a good offense", the French proved this mostly false with expensive but failed counterattacks. The British saved the French in 1914. Joffre would not have had the time to shift forces for the first Battle of the Marne if not for the BEF's stands at Le Cateau, Mons, and Ligny.
In all, the German plan was good if technology had been ten or even five more years advanced than it was. Motor transport would have ensured the fall of France in 1914 just as surely as it did in 1940.