Well, gee, El Pip, guess the people who wrote that the EV D VIII had fully cantilevered wings didn't know what they were talking about. They can't have been right about the Germans only giving the D rating to planes that had wings as sturdy as biplanes. The Fokkers were Dutch, too, not German and that presented a further hurdle.
Allied fighters don't name a plane the Flying Razor, if it's something they want to go up against. Being faster those top-notch biplanes could run away.
The EV won its July 1918 competition against biplanes, too. Had the Luftwaffe existed post WWI, the EV D VIII would have been its primary fighter. How long would it have been before the French and British followed suit? All those biplane exports lost and 10s of thousands of biplanes scrapped?
Now you're in a race against time to get monoplanes to replace all those biplanes.
So you're developing jet engines, guided missiles and presumably radar. Your other research would therefore be fighters for the fleet air arm and fighter command.