Other than the customization done by Rafa, which I understand is the addition of weight to change swing weight, twist weight, balance, static weight etc, there’s not that much of a difference, for the average player, between a 20XX pure aero and the original aero pro.
Actually, there’s not much difference between this line and the pure drive. We’re talking about minutia here.
amateurs care about this stuff more than advanced level players.
if the pure aero ceased to exist, you could just put a customized pure drive in Nadal’s hands and he’ll do just fine. He won’t complain, but a 4.0 will keep switching racquets and tensions mid play because they think it makes a huge difference…. It’s all in their minds.
IMO