notwithstanding the fact that research and science (spc. #1 & #7 here) wholly dismisses your suggestion, how do you explain Scrabble champions who use profanity? or book, technical and speech writers? or professional public speakers? surely these are not cop outs?

and how is pain relief, non-violent response, bonding, and health benefits "not a good thing?" perhaps these are not real benefits to you, but surely those in pain, battered partners, those seeking inclusion, and those interested in their own health would disagree. as to battered partners, you can be certain that much great power comes to one who, in part, uses profanity to dominate their victim -- the battering likely begins with verbal abuse and continues to fuel the physical battering and cowering of the victim.

as for expanding one's vocabulary, aside from the writer's own suggestion that "It also broadens our register," adding any number of words to your vocabulary is to expand it, so, there's that...