It's the original definition of "vulgar" - "characteristic of or belonging to the masses." Hence, it became taboo for the upper classes to utter vulgarities, because it signaled lack of learning.

Contrast: https://tvtropes.org/pmwiki/pmwiki.php/Main/ClusterFBomb

I mean you could insert a variation of "fuck" half a dozen times in the above sentence and it would add nothing of value to it.

Am I suggesting you should do this with all your sentences? Absolutely not. However, I would certainly not read the two sentences the same.

(Food for thought: spices do not generally add nutritional value to food. Yet, each has their own preference as to whether, and how heavily their food should be spiced.)

Here, now, I call nonsense on that one. I (probably?) swear more than most of my friends in private, casual communication circles. I also have a much greater vocabulary than any of them (this is not hubris --- I'm frequently told to explain words I use; I chalk this up to being better-read throughout my life). It just doesn't follow that because a person favors certain words, that they must not understand or feel comfortable with others.