.....regarding how hard some find it to think beyond their own preferences as "fact".
Take the concept that a watch "should" cover 2/3 to 3/4 of wrist space. As far as I know, there is no scientific fact to this view. It is just one person's subjective view that is ONLY true to the person with that view. Now, there may be many with that view and for each of them it is a subjective fact. But to those who think the concept rather foolish, it is not a fact at all.