Refer to earlier post, the DB 109-016 was tested in March 1945 at
28,652 lb thrust- the world's greatest jet engine of the time.

Except for some mock up bits, the DB109-016 was never built or ran,
neither did any number of other fairly ambitious designs. But neither
did any number of Allied projects of the same period that were, in their
own way, just as advanced.
The German effort in such was driven by desperation, while the Allies
didn't have the same level of pressure, so could afford to be more
conservative, but certainly had the wherewithal to get advanced/exotic
if they had to.

That Germans were the first to connect some dots in some engineering
which deserves some appropriate historical footnote, but there simply
isn't anything special about the Germans for having done so. It is like
suggesting that Glenn Curtis was "better" than the Wrights for hinged
ailerons instead of wing warping, and that anyone who used ailerons
afterwards was some kind of thief/mental midget for adopting the idea.
Basic physics would have lead anyone to the same conclusion/solutions
for all kinds of stuff, WHEN is simply a matter of circumstance.