And I agree with you as well...to a point.
The problem comes with different weapons that all use the same bar. Take the Acrius range stat and take any sniper range stat for example. Absolutely no correlation at all.
Saying +10, has extremely different results depending on the weapon. +10 on a scout could be 60 feet (just for arguments sake), and on a shotgun it could be 3 inches. The stat bars are practically useless, and saying "+10" could be equally useless.
My point, without getting too long winded, is about making stat bars uniform between all weapons, and having a set constant number between them.