You go and ask any quickshifter manufacturer how important 'kill timing' is.... it needs to be perfect
Just to follow on from that....
The problem with quickshifters is the time it takes to kill the ignition, unload the gearbox, change gear, restart ignition. That's called the Kill Time.
If the kill time is too short then the gearbox may be damaged (crunching, resistance etc). A kill time too long will cause the motorcycle to "lurch" during shifts.
Each gear change has a different Kill Time, because the 'change gear' part varies from gear to gear. Quite often you could set a kill time of 150 milliseconds and gears 1,2 and 3 with be lurchy.... but 4, 5 & 6 gears will be smooth. Set a kill time of 30 milliseconds and gears 1,2 & 3 will be smooth and 4, 5 & 6 will be lurchy.
As an example, HM Quickshifter sell a product called the 'seamless shift' (which I bought for my 205 BHP ZZR1400 Performance Sport, because the last thing I want is feckin 'Lurchy' !!)..... this seemless shift dynamically adapts 'kill time' using advanced predictive math in the form of non-linear Kalman Algorithms. So in theory, every gear change kill time is perfect as it dynamically adjusts and learns. Well in practice I used to occasionally get a missed gear at 9000 rpm and shit myself
... 200 BHP at wide open throttle, so fuck Kalman Algorithms.
If timing wasn't a problem, why go to all this feckin trouble to manage 30 to 150 milliseconds between gear changes.
Timing is EVERYTHING.