Fighter Pilots Can’t Fight If They Can’t See
War Is Boring

Hartmann had 7 kills against Americans, the rest against Soviets. Quite a few Soviet and German pilots had astounding numbers of kills because they fought (and won) for several years.

Regardless, it is astounding the military has pushed onward with the F-35 despite its glaring flaws. Not being able to check your six is a big problem in a jet designed to fire its two air to air missiles, then turn and run.