>> there comes a point...and I respectfully suggest that YOU'VE REACHED IT
I like the saying "I've gone so far around the bend, I can't even see it in my rear-view mirror".
If there is ever a poster boy for O. Seed D., I want to be that poster boy!
>> taste/flavor is as individually subjective as flower scent,
I agree with you that, within something as complex as "flavor", even sweetness and tartness are not as simple as sugar content and acidity. Those two probably are objectively measurable, but only slightly more intesting than text descriptions of Janis Jopin's voice compared to Pavarotti.
And of course climate, watering and soil conditions can produce "eww", "ahh", "yuck" or "hunnh?" from the same seeds. And one gardner's "eww" will often be another's "ahh".