Your point seems to be simplicity of technique, but if you are flying a heli with a low inertia rotor, the actual difference in rate of descent may be small.
Still, regarding your example, and as someone pointed out before, you will probably not enter autorotation on a nice final to a runway. Therefore, if you want to increase/decrease range, to reach a specific point, you will have to use not only rate of descent, but also speed. Higher NR and lower speed to decrease range, vice versa to increase range, but then you have to adapt your flare technique to the lower/higher rate of descent.
Theoretically you may have a point, leaving the lever in a fixed position may be an "easier" technique, but then the increased rate of descent will force you to start the flare higher and/or be more agressive, probably something you don't usually train... Then you have a higher chance of hitting the ground with the tail, misjudging your height for collective application, etc.
In real life there are so many factors, there is not a "one size fits all" solution...