No one said it is irrelevant. That’s you reading what you want to out of it.
The “difference” of 0.15 sec TOF on a game animal taking a step at the exact moment the firing pin hits, is functional irrelevant. And that’s about the worst difference you could come up with. The differences between a 300 Weatherby and a 6.5cm at 500 yards is about .088 seconds- that is absolutely not observable- about an inch or so for a walking deer if my math is correct.
It’s a point that makes up so little of the total percentage of factors that goes into a shot, that when you state that it makes a large, meaningful or noticeable difference, it calls into question the experience that you would had to have to see it.
Hence, my question of what bullet and what MV you use? Because to see that .15sec TOF amount to anything on game animals one would need to shoot hundreds, if not thousands of game animals at 500 yards that took a step at the exact moment the firing pin fell, then they would need to recognize that it happened, and to catalog it, and gather the data over all of those animals then lay it all out to see a trend.
Now, I can’t say that you or someone else doesn’t have that body of evidence required to state that, however I have killed those numbers of animals, and in all of those probably on one hand could be counted the amount of animals that took a step as the trigger broke past 300 yards.