I didn't invent the MA.
What makes a plane popular?
One of two things.
Either it has better performance than every other plane (la7), or
it has good performance and Hispanos (Tiffie, F4U-1C).
Hell, the Ki-84 is better than a Spit-9, handling wise. Why is it going to be a solid 6-7 after the La-7, P-51, Spits (x3), and Tiffie? Edit: Forgot the Niki.
Firepower.