Matthew's comment places the main limits on France's naval contribution outside naval air defense. Better anti-aircraft armament might alter the timing of the German attempt to seize French ships. Under favorable conditions, more ships might escape to Allied ports and join the Free French, but the overall effect is considered limited.
Notable Point · 1:50:21-1:50:38
Why better French anti-aircraft guns would have limited strategic effects
France's main wartime problems lay elsewhere, although stronger air defenses might help individual ships escape to Allied ports.