Too bad then, lots of lives could have been spared on both sides. It was the mass production of the P-51 Mustang modified with the Rolls Royce engine in late 1943 which gave the Allies the edge in the air war. Prior to that I don't know how much damage could have been done since the Nazis had for the most part control of the skies over Germany.
Which harkens back to another military truism, "Amatures study tactics, professionals study logistics!"
Read Albert Speer's "Inside the Third Reich". He agrees. He studied the bottlenecks in German industry and concluded that if the Allies had concentrated their bombing against ballbearing and oil refineries they could bring German war production to a virtual standstill. The funny thing, at the same time that Speer was arguing to disperse German ballbearing production, Bomber Harris was arguing that the Germans must already have dispersed it. In the event, the Allies started targeting ballbearing production only after it had been dispersed, but there was a window of opportunity. OTOH, oil production got about 5% of Allied bombing and caused about half the decline in German war production.