It's not a strawman, it's you being shown you are wrong, have been wrong and always will be wrong on the subject of Hit Points being defined the way you're trying to define them. You CAN play them in other ways (it's a HOUSE RULE) but you grossly misrepresent what they've ALWAYS meant by definition of Anderson, Gygax, Cook, Cook, Tweet, Williams, Heinsoo, Bonner, Collins, Wyatt, Mearls, etc.
The overnight resource replenishment is just as realistic as not, whether or not someone actually likes it because Hit Points again are not that closely tied to actual wounds/physical damage.
Look at it this way, at the end of each and every day in real life we are worn down, even martial artists, soldiers, etc. Look at soldiers especially. They may have cuts, bruises or whatever but in the end what they need, just like every other human being, is sleep.
Sleep re-charges the body, speeds healing and when they awaken in the morning they are re-charged to take on another day. The bruises hurt a bit less, the scrapes itch a bit from healing, etc. They're up and going again. They're not perfect, but Hit Points aren't that granular either. There's no "Severely Sprained Ankle" or "Dislocated Shoulder" condition/mechanic, and a twisted ankle or popping a shoulder back in to place are things adventurers have to deal with and still perform just as well with or they die.
Except there is always a physical component to hp. You take damage from being hit by ings in combat and stuff that is oysically deadly does more damage (that fireball is draining your luck, its burning your flesh). Most people play the game with hp largely being about physical damage. You can not sleep off physical damage in 8 hours. up until 4e this was understod in how healing worked. Clearly the designers made natural healing slower to balance out the tesnsion between the physical and non physcal aspects of hp. 8 hour healing goes entirely in the direction if non physical.
No amount of arguing over definitions is going to change the fact that this really bothers people. If they insist on one day healing and HD as a core rule they are going to lose peope that expect a touch more realism from the game.