It's all about impact velocity for performance on game when it comes to bullets in my opinion.
Every bullet will have a impact velocity range, in which it is supposed to do it's job as designed.
Some of those velocity spreads are narrow and others are broad.

My guess is that in the specialty pistol world for the majority (whatever that is), is that when hunting, the distances are not going to be far out there, so they may just work with MV and call it good. Simply a guess, on my last reason of why people are talking that way.