See, I get this. I really, truly do. All I'm asking is that they throw the Verisimilitude Dog a bone.
Maybe every PC hosts the vestige of an ancient hero that provides supernaturally fast healing? Great! Maybe any PC that is crazy enough to adventure without the (extremely rare) trait of regeneration is slaughtered before he makes it anywhere close to 1st level? Great! I can probably think of 10 more explanations of various satisfaction levels in three minutes. And were they offered as an in-game explanation for the 6HM, I wouldn't be in this argument.
But they offer (as far as we know) absolutely nothing. Just "oh, sure, you were a hair away from death six hours ago, but now you're dandy!" That's not throwing a bone, except in the sense that we don't need to mention in front of Eric's grandma.