I disagree. You cannot pre plan for years when the situation is constantly changing. The German lost the strategic initiative by 1942 and were reacting the Allied developments and strategy. They simply did not have the luxury of sitting comfortably in England and steadily building up their forces according to the planes they hatched. There was a war going on in Russia, which had to be fought and won. Firefighting was exactly because the original plans were constantly rendered obsolate by the events. There was no such pressure, ever, on the Western Allies. Sure they would need to get back on the continent, but there was never any deadline for that.
I mostly agree but 40-mid 42 was full of crises from British PoV. And if Germany didn't invest enough to jet engine development GB had the same problem, maybe worse. For ex jet a/c airframe design was given to Gloster, not because it was known to be high speed a/c specialist but because it had free design capacity, partly because it had not produced succesful fighter since Gladiator.