Years ago I worked in a step down unit for infants and toddlers. Beds 4-10 were all trached. Five out of the seven were ex-premies with severe lung and brain damage. They were all full codes. I got very good at putting atropine and epi down trachs. They were not ventilated, but they had feeding tubes and had minimal or no ability to feel joy. They got multiple IV sticks. They also had to be suctioned numerous times a day. One of my patient's only joy was his pacifier. The only problem was that he could only keep it in his mouth for 5 minutes. Did I mention that only 1 parent came more than once a month. Some parents never came. I learned how important quality is versus quantity.
It was a valuable lessen for when my husband became critical ill in the hospital. I was able to tell him that it was ok if he died. When he coded, my first thought/prayer was "Lord, just let him live." Within a minute or two I prayed "Lord, whatever your will is, whether he lives or he dies, do what is best for him." It is the hardest prayer I have ever said. They pronounced him within 30 minutes. We were only married 2 years. I was only 30 years old.
I agree with letting nature take it course. But I am thankful that I never had to sign a DNR.