I think I came off wrong. I’m just saying that the time to hurdle one is the same thing as time to 10m, essentially, in the they are both measures of acceleration. Time from H1 to H2 however, or start to H2 would show whether or not the change that was made is improving the race after H1, from better launch angle, smoother acceleration, etc.
In addition, it’s possible to come off the first hurdle at the same time, but have a higher velocity. Though it definitely makes you think about why we are switching steps if the overall time is the same.