Hobbit on Quest
Replace "fall down a mine shaft" with "get stomped by an ogre" or "run through with a spear" or "incinerated by a gout of lava". It really doesn't matter. Here's a quick recap: Clever listed his beef with fast HP recovery; you decided to criticize his comment with "but HP aren't meat points (except when they are!)"; I chimed in to point out how your critique wasn't helpful in this instance, and kind of misses the point.
Honestly, the root issue here is more along the lines of assuming too much when losing hit points. "Run through with a spear" isn't a particularly appropriate narration to anything but a killing blow. This has been an issue with D&D for a very long time - DMs (and players) like to narrate a certain amount of gore. But as characters gain advanced levels and hit points, the game has never really supported it.
This brings up a parallel question - how much of your immersion breaking is caused by the game's rules vs how much is brought to the table by you in the assumptions and perspectives you bring?