FLTWS
Headphoneus Supremus
Yes and no. I use the visible mark to see whether a recording has low or high dynamics. So maybe next time I don't cranck it up too far to fast on a heavy compressed recording. For the rest you are right of course.
I prefer to have the correct sound level right from the start, so I don't have to correct it during playback.
Back when a star burst pattern of some sort sat on the face plate behind the knob it was easy to hit repeat settings for a given recording or returing to a precise spot when turning down the volume during A/B comparison listening. The starburst pattern may still be fairly common on pro audio gear.