I've always thought it was an amazing bit of luck that the Nazis never seemed to push as far ahead with their experimental aircraft as they could have done.
They didn't put funding into developing the turbojets used by Heinkel for the HE 280, nor the Messerchmitt Me 262 (which was a very advanced design for the era), plus they dithered and changed their minds as to exactly what they would use the new aircraft for. In the case of the Me 262, there was nearly 3 year delay in equipping them with a half decent engine, as the airframe itself was ready in 1942.
If the Luftwaffe had started equipping squadrons with those by early 1943, rather than March 1945, it probably would have changed the war.