No aspect of functional movements is more important than their capacity to move large loads over long distances, and to do so quickly. (Gregg Glassman)
Work = Force*Distance
Increasing force or distance means you have increased the work you are doing. In addition to carrying a larger load during runs, a taller person has a longer distance to travel (say for burpees or B&T) and therefore performs more work when they are moving at the same pace as a smaller person. The taller person has to move a longer distance to reach the ground, kick the feet out, even to squat!
Power = Work/Time = (Force*Distance)/Time: Decreasing time means increasing power!