343 - Change for the sake of change.
Actually, it's just one of the many poor design choices they had to make in response to the low aiming skill gap. I know it sounds like I'm beating a dead horse here, but the amount of crappy things they've had to do to accomodate the low skill gap is ridiculous.
Bad Strafe/High Aim Assists lead to...
Flinch: the descoping mechanics no longer worked because it was too easy to land shots, leading to a frustrating back and forth battle of rapid scoping in and descoping.
Lower weapon damage: with easy aiming, too many players could kill too quickly, so they needed to decrease weapon damage to bring the average kill time up. This in turns makes power weapons nearly insurmountable because of the wide disparity in kill times.
Bloom/Spread: in order to decrease the effectiveness of certain weapons at range, they added in randomized elements in the form of bloom and/or spread.
Armor Abilities: since there was now little variation in firefights (when everyone can land most of their shots, battles become very boring), they felt the need to add "wrinkles" to combat to keep it fresh. Rather than allowing the interplay of skill and strategy to be the variety, they needed to add armor abilities to change up the flow of combat.
Sprint: with the slower player speed and slower kill times, they now needed to recreate a sense of speed in the game. Enter sprint.
While those last two may seem like a stretch, I honestly believe that the lower shooting skill gap supported, if not engendered, their inclusion in Halo. If you fix the shooting skill gap, all of those "fixes" are no longer needed. Descoping is viable again because it's not a constant stream of back and forth when players miss, you can increase weapon damage while still maintaining a reasonable average kill time, you don't need to limit a weapons effectiveness through randomization because it's much more difficult to use at range, combat is more varied because individual player's abilities create the variety, power weapons are no longer the auto-kill-no-thought weapons they are now, the game exponentially increases in speed due to faster potential kill times....
I could go on.