My overriding sense is that this is such a deeply, ethically complex issue, that it absolutely needs to be discussed from all angles, and discussions like here, on this thead, are so important. Perhaps the key value of Kathleen Stock's article is what it brings to the debate.
What comes up for my own part, is having had two pets euthanased, which felt like a compassionate act; an act of love, I have often wondered why we view it so differently and prolong suffering for humans (I think about having also had the experience of living with a parent at home suffering long through terminal illness).
I also know, having been through one prolonged and painful health condition- and how small and focussed on suffering my sense of self became at those times, that if I had thought there would be no end to this, that I would not want have wanted to live that way for ever.
I also would not want to live feeling I was a burden to others. These are my personal feelings. In that instance, I am imagining I would welcome the option of being able to choose a way out.
And then, I read the point made by TempestTost here, and it makes me think again, from another perspective:
..the underlying issue is that having introduced a new principle, people begin to apply that principle to other issues, and to it's logical conclusions. This may be less obvious in the first or even second generations, where people have qualms left over from the old way of thinking. But soon enough you have people who have never had such qualms and they will not shy away from applying the principle in full.
To me, this uncomfortable to and fro-ongoing between confronting aspects is vital.
The tension between the personal and the universal; the immediate and the far reaching.
I think we so struggle with the discomfort of complexity, perhaps now more than ever, and my biggest concern would be that there is a rush to resolve the issue, because we as a society don't currently seem to have the maturity to sit a bit with the contradictions and discomfort of the dilemma in order to come to the wisest decision.