Hi Sam,
Yikes. You could have asked why Ven-Top was subdivided into 10 equidistant sectors.
Have you ridden Elevation Evaluation in Watopia? You might recognize the segment board on Ven-Top is very similar to the one used on The Grade.
We used this approach rather than the AdZ approach because The Grade and Ven-Top are both climbs with a steady-ish gradient. On a climb like this, your power / HR stats from sector to sector will show if you’re able to maintain a steady-state effort, or if you’re sagging / surging as you approach the top