I wouldn't think that giving morphine for those dying would just be assumed to be a given to do, if the dying was not actually in pain. I wouldn't think you'd need an advanced directive for that. Another poster here who was a director of hospice care indicated it was not, yet they gave it to each member of my family just as a matter of course. Why?
I am not convinced I would not want it myself if I was in great pain. I probably would. But I think if it was not necessary, it shouldn't be given automatically. Do you? If I did not need it, then I think transitioning without being stoned would be better, as I said at the outset about insights and all that.
That is of course if you viewed that the essence of your consciousness continues beyond the body's death, as I do. If you don't believe that, then it's not really an issue either way, I would think. But maybe not even for some atheists. Which would you prefer, if you were not in extreme pain? Lucid, or looped?