starting from a roll is for people with torque.
Starting from 5-10 MPH is a better representation of what the car can do, not just the driver. When I race my friends, we go from a stop (through all gears), then a second-gear ONLY pull from 10 MPH, then possibly a 3rd gear only from 40.
Yes, it's a little over structured, but you can really see where the strengths and weakness of the car are. From a stop, the higher HP has the advantage. The second-gear pull usually goes to the more torquey.