I agree, but: isn't there actually a bizarre thing of that sort in the game already, WRT the German MMG/HMG? Same weapon, just assuming there's a more stable mount and more ammo? "It was used like an HMG so we're giving it HMG numbers", seems to be the rationale.
Heck, at some level, the entire Morale concept works that way. ML8 guys can stand faster because, well, they did. Even with Inherent Firepower, which is a mish-mash of real-life factors that all boil down to whether a squad gets 3, 4, 5, even 8 FP because that's the right "feel" in the game. And isn't there some squishiness to Vehicular Movement Points, based on doctrinal use rather than sheer horsepower and carriage weight?
No, I'm not foolish enough to think CH was actually taking advantage of a Game Design Pattern rather than just being lazy (or heck, even having a proofing typo on the counters), especially with a discrepancy of this magnitude. Just sayin' that the overall concept isn't completely foreign to ASL.