The retreat from Falaise was a fighting one yes but it was launched too late, The gap that they could escape through was getting smaller and smaller, only 2 thirds of the German troops got through, There were probaly just enought supplies left to get those Tanks and vehicled back to Germany maybe a little further.

And considering most of the stuff was destroyed by allied action, Wasnt that stuff only destroyed in such large numbers when the gap was so small there were only but a few roads that the stuff could excape on.

The fact is that They would have had a better chance if they were allowed to leave earlier, Not wait until the last possible minute.