So, because I hurt my shoulder and am in pain I read the whole thread as a distraction and it worked ... because greater pain can overshadow weaker pain.
Boy, does this discussion goes in circles.
First - Supernatural Fighters.
So - are fighters in D&D supernatural? If you compare them to earth humans - yes. Also James Bond John McLane, Hawkeye and Co are supernatural in that regard.
That comes with the territory (Action Genre).
Why are "mudane" D&D fighters tough term then their earthly counterparts?
Because it is a game and without them being tougher the game would be quickly over.
In like 99% of all Action Games the characters, be it PCs or NPCs, need to be tougher in order to have a satisfactory game experience.
Counter Strike (or Fornite for the younglings) would be boring if you die (or get incapacitated) by one bullet hit.
The same with D&D - if my character would be real, it would have 1 maybe 4 HP max and never get more. The game would be over after the first giant rat.
The same with Action movies. If John McClane or Conan only could withstand what a normal real human could withstand, it would be over after the first encounter.
It is a concession to the Action Genre. You need tough characters or their would be barley any action in it.
And D&D is an action RPG.
In a physical sense Call of Cthulhu Characters are more realistic. They will not win a fight against a Lion ever with their bare hands. But Call of Cthulhu doesn't have 80% combat rules.
Second - Taunt ability and suspension of disbelief
So, now we know, why fictional Fighters in the Action Genre are tougher (supernatural tougher) than normal humans. Its needed in order to function as intended.
So, what about other unrealistic stuff? In D&D we have Magic, Monsters and so on. That is also needed or it wouldn't be a western fantasy rpg.Thats fine, too.
But for any Fantasy/unrealistic thing to work, we need realism in other places. How much is Genre dependent.
If their would be suddenly Aliens in Die Hard, John Wick (or Indiana Jones!) people would hate it. If John McClane could at will breath fire or Taunt all people always into attacking him, it would kill them story. It would break the suspension of disbelief for a lot of people.
So D&D, Action Movies and so on are unrealistic where it is need to be in order to function. But they need to be realistic where they can. Like in social interactions in D&D. They ground the game a little bit more in reality. They make the world feel alive (when done correctly).
If you make anything, every aspect, unrealistic, the game or the movie would be unrelatable.
Thats why a lot of people here hate the Taunt ability. It sucks, because it causes (NonPlayer)-Characters in the game to behave unrealistically in comparison to real world people. Which breaks their suspension of disbelief. Suddenly they are not inside the game world anymore. Suddenly they are at the game table and John used a homebrew character ability that wouldn't survive any playtest.
So you always need a degree of realism in your story. And "human" behaviour is the most important thing.
People can accept Magic, Dragons, Tough guys, but if a person doesn't behave like a real person in that unrealisticnsituation would, it breaks most people's suspension of disbelief.
That's why the Taunt ability is bad.
For other realistic or unrealistic stuff (outside of "human" behaviour) it depends on the individual how much realism they need to stay grounded.