I measure everything just because I can, and it's easier and faster to do. I'm sure I'd be able to do that by feel, but it's unnecessary and less precise imho.
for some of us "precise" is only accomplished by "feel" --- i think your method is great! --- but i just wanted to chime in with an alternate (but useful for some!) POV. each of us might defend our methodology for achieving 'best action' but either method (or any other?) is only the "best" if it suits the player and the player's needs/purposes.
i think many newbie-er players simply don't know what they want (or need, to get started) and too many trials at too many 'settings' can get too confusing. i also think some 'old dogs' know exactly what they want and others just adapt to 'whatever' settings without regard to 'optimum'.
since all my axes are fretless (but different), and since all of them have slightly different neck/fingerboard 'feels', and since i use a couple of different string types/gauges, and since i might use one instrument for certain applications and another for other applications, and since i like different techniques at different times = not one set of numbers would be useful to me (except as a starting point). so going by
feel works for me. that said: in spite of differences that i can certainly 'feel', most players picking up
any of my axes remark that they are "easy to play" or that i have my action set "really low" or "too low." i actually think my action is a happy "medium" (for fretless) to allow for some digging-in (my version of "digging-in").
TL;DR: going by feel vs. measuring = doesn't make any difference if you know what you're doing....if you can get what you need for maximum benefit (control of technique/performance).