Which was the whole point of the Maginot line, to channel the German advance through Belgium where a defensive line was to be established, so it was a success. Everything else - reconnaissance, defence of a forrest thought impenetrable to mass formations, coordination, adaptability to the changing environment (the Germans pouring through the supposedly impenetrable forrest), officer competency, coordination between army and air force, and coordination with the British, were massive failures.
The Line was a necessary component of a defense. It just needed more, that was not done.
Without Czech armor, the invasion might have failed. Predicting the Germans would have the full resources of Czechoslovakia would require more prescience than we should demand.
