I understand B1t needs time and that it doesn't take 400 ms to line up to the head, but I still don't see how it definitely improves ttk.
I agree a higher HS% might be correlated with better crosshair placement, but even a higher HS% does not imply that a player is shooting only headshots. Most pros with high HS% (Twistzzz, etc) and even B1t actually shoot 2-3 bullet bursts to the head and don't 'one tap' as often as you might think. Because of this, if you shoot those same 3 shots to stomach, you will likely get the same kill in the same time. Of course 3 shots doesn't kill, but it takes 'less time' to hit stomach then head since it's a bigger target so I don't see how this single statistic indicates a better rifler.
Also, yeah B1t needs time, but t2 ish players like Ax1le, mir, etc have shown so much better results in less time from t2ish to t1ish, which casts doubt on either team environment/roles for B1t in NAVI/B1t's individual level.