I think it is not a waste of time, and such data can only help to determine several things. The ideal or acceptable speed for the individual course and collective membership. Also, the ideal cutting height and seasonal adjustments and other cultrual practices for the super. It is good to know when things are too fast, and not acceptable as well. I think Crystal Downs has seen green speeds too fast for greens like 10 and 11.
I'm not sure if I understood Mr. Morris right. Did they ask the members on a daily basis to inform them merely if they liked that days green speed? Or, did they ask multiple questions like, was the green speed and consistency of a true roll enjoyable? And, did they find the speeds seemed consistent from green to green. Would they like to see the greens slower, faster, or status quo?
I think you'd have to match that secret graph to a few criteria as mentioned above. You might get different correlations. 11 greens may appear too bumpy, too fast for the contours, etc., and elicit negative responses. Days of 8.5 greens may settle into a status quo that builds a consensus for enjoyment for matching contours, true rolls, and healthy turf that becomes the standard, even though they originally thought they'd want it faster. Then, I think preferances would emerge from course to course, based on area of the country, turf species, and culture including private or public.
Maybe the increased amount of info is daunting, and maybe a long time super knows most of this, although the indicatin in the video was than supers expressed no idea where their users were at on these matters.