It's a competitive game. The better you play, the smoother it's supposed to look. If you shoot while moving, it better show in a rougher performance all the way. More so, it'll help people to play better. Because how do you know without going deep into reviewing your demos in slow motion, when you're failing your counter strafes? So you can immediately know when missed shot is your fault, and not a lag, bad hitreg or whatever other reasons someone can cook up.