Cadence measurement is important. But maybe not for the same reasons for all the times. New riders need to take cadence into a broader context. More important to a new rider is the pedal stroke.

With a high cadence, you train your body's cardio and pulmonary system to adjust to the fast spinning even with an easy gear. Your muscular system will eventually get accustomed to the spinning and your heart rate will adjust as well.

At the beginning the heart rate will go up and you will want to quit doing this. When you achieve a certain proficiency at this, you can ratchet up the gears, meaning pushing harder gears. At those higher gear ratios, your spinning range from low rpm to higher rpm has already materialized. You're a better rider with the ability to spin at different ranges under different circumstances.

The cadence measurement will display your spinning effort but take it into context as to your process of conditioning. Riders take the same routes year after year, so as you become familiar with the effort it takes to go 30 mph on a sprint, then you will know what the spin should be as well. Same goes for climbing.