>lick finger, wave it around feeling for crosswind
>whip out a micrometer, measure a 0.47mm pixel offset
>dive to floor, prone. ass up.
>wait for stamina regen because it fucks aim
>line up shot on target
>wipe sweat off my helmet forehead
>use my massive brain to account for 5m bullet drop and 0.2m deviation at this range
>"Got you in my sights motherfucker."
>unload six shots into the target 5 meters in front of me
>target jitters to the left slightly
>miss every shot
why bother

Lets say, for the sake of argument, you had a tool with the means to temporarily reduce the armor class of any enemy by one point across all body parts. Nanomachines, or something. How badly does the game's balancing go out the window?