When it comes to thugs I can quite confidently say it's one of the most realistic parts of the whole game.

You ask the wrong question.

Why did Bethesda turn these series into a pure slash & hack game without depth?

It would also be nice if your speechcraft skill came into play. For example, if you get knocked down to one knee your speechcraft ability and perks should help you talk your way out of getting killed. It would be great for a more cowardly type character and would give more uses for speechcraft.

I've had some of them who really yielded. They ran from the fighting scene, hid behind a rock, and stayed there, hidden, until you leave the place. These ones never attacked again.