I don't think I agree. I frequently go to bed much later than I should and can function on very little sleep. But it's bad for me and probably makes me age much faster.

A visualization of how much sleep I'm lacking in order to satisfy some basic sleep requirement would help towards alerting me to go bed earlier.

Also if I'm doing something to improve my quality of sleep (meditation, no digital devices an hour before sleep) it is rewarding to see that I'm sleeping longer and deeper.

Your reasoning can also be used to dismiss exercise tracking. You just exercised and you know you feel like you put in sufficient work. What's the point of knowing if you "competed a circle"?