Even with a stud and nut, doesn't the nut have a friction interface with the threads and the bottom of the nut, just like a conventional bolt and bolt head?
Not saying you're wrong, just thinking out loud here.
I always understood that the use of studs in "performance" engines was because the likelihood of the heads being removed and installed multiple times was greater, and a stud's hardened threads wouldn't be as prone to damage as the aluminum threads in the cylinder block, if a conventional bolt were to be used.