I didnt  read the rest of your text. If you want to talk about tentpoles, open a  threat, talk about it. My threat - this one - is about the current  pointless addition of a skill which prime use for most D&D players  is its stabilizing of the dying. And this becomes redundant due to the  healer's kit that anyone can use wihtout role, without skill. 
You are laughing now, right? Because I did feed the troll again. 

 It's been the last time, promised.
Well, read my text again please. I wrote: "Nothing some background stuff and the perception skill couldn't handle." I am no native english speaker so I try again more clearly:
With some background stuff (i.e. physician, healer or something) 
and perception, you could do the trick as well. Such a background would easily provide the needed knowledge for this situation. A healers background and a healers kit as a tool is much more flexible and useful for 5E than this 'stabilizing the death' skill which central rule function is void because of a much easier to use healing kit in its current form. If you have much illness detection in your games, play a healer. I had it 2-3 times in over 30 years of DMing and playing. 
And I won't answer another fluff story for this, because it simply is not the point here