You ignore the fact that popularity and even k/d are not shaped by the actual performance values of the aircraft.
BnZ, geez man, talk about ignoring facts to cling on to straws, I already explained this to you. When popularity is HIGH, say >10,000 kills/tour, the K/D is an accurate representation of the actual performance values of the aircraft in the MA environment. Since the Spit16 does not have a high K/D, yet has HIGH popularity, the plane is not dominating. Maybe it's just not as good of an MA plane as YOU think it is. These numbers don't lie.
So...having a popular plane that is faster than 70% of the fighter set
You also say this with such vigor as if 70% is even a high number. It really isn't considering the 30% that are faster are some of the most popular rides in the game. P51D, La7, 190D9, K4, Typhoon, F4UD, F4U1A, Fw190D9. All faster, incredibly popular. The only planes that are popular that aren't faster are the Zero and the N1K2. So for all intensive purposes, the Spit16 is a slow plane compared to the bulk rides being flown in the MA.
Concede defeat at any time.