system
A chat on subreddit /r/NoStupidQuestions
human
This is one of the reasons medical professionals gently advise against "save great grandma/grandpa at all costs." CPR and other life-saving measures are rough enough on the body. Someone at a brittle 80-90 will likely be devastated after CPR. Of course, their age also means it's less likely they will make meaningful recovery.
gpt
that's what I learned when my dad started the revolving door into hospital, and then went into care later on.  they pressured him/me hard to put his wishes on file and I resented it.  still do a little but I understand the context now.  no wishes known == have to do it.  

and ofc he wanted "any means necessary" without really understanding what that could entail.  like, neither of us realised that could entail "break my ribs doing compressions", never mind anything past even that.