I'd rather they reduced to a degree some of the ridiculous extra advantages piled on to Resilience they've added in PvP, rather than fuelling an arms race of buffing. As far as balance, the strafe speed alone is a MAJOR advantage in PvP particularly for peek shooting. That's not specific to Class of course, but something *sometimes" forgone mainly out of necessity for the "Class stat" of Titan/Warlock. Any Mobility buff will 'break' (further) an already broken, imbalanced game. Also a tangential issue is the terrible system of targeting acquiring new Exotics to change any proposed Stat importance. It's also generally a terrible stat system to boot. These need changing anyway but until they do it's a further disadvantage to change weighting. But it's tangential. The main reasoning not to do so is above.