The British AF were downing German bombers and fighters at rather a rapid clip but at a distance that the soldiers couldn’t see.
They lost 106 aircraft, the Germans lost 156. A good score by the British RAF.
Had the Germans successfully bombed the beaches they would not have won the war. .
The British lost 6 destroyers early in the fight and held the rest in reserve other than moving in one at a time for rescue.
A remarkable battle fought brilliantly by the British, the French and the Belgians.
I don’t think they win if they bomb the beach. 300,000 men is a lot but the British fighting force peaked around 3 million. 10% loss at that stage in the war would be painful, but not fatal.