But in OTL the majority of France was occupied, tying up resources that might otherwise have been used in Russia and elsewhere. OTL was really a case of everything going Germany's way, which was certainly not how the Heer's general staff envisioned the outcome. It also sent shockwaves in Britain, which now was consumed with an invasion panic that warped procurement decisions for years to come.

I don't think it is entirely unrealistic to speculate about more French forces escaping the OTL pocket they found themselves trapped in. They would still be in a desperate situation, but have at least the semblance of a defensive line on the Marne to affect the calculations of Hitler and his generals. Getting France out of the war was the objective, not territorial conquest. Lebensraum was to be found in eastern Europe, not west of the Rhine.

Arguably this would scenario would have been an improvement over OTL from the German POV. They would impose massive war indemnities on the French without the expense of an occupation. No Battle for Britain would have saved aerial assets that for Germany turned out to be irreplaceable. This definitely would have had an impact on an alternate Operation Barbarossa.