alosso: Your point above is correct for the carry but only partly valid for the total shot length.
Enough space provided for the roll, many uphill shots land earlier but roll
longer to approx. the same distance w/o backspin (given my G20s
The point deals only with the trajectory. Total distance is another story. Getting on the green is the objective and what happens after that depends on wind, spin, landing and green speed.
Then again, you have to stay awake to understand it.