[grandfield]

Problem is that it's not all-or-nothing. Lots of activities have failure modes that leave you severly disabled for the rest of your existence, even unable to do any of the standard suicide activities or even speak/write.

That's all worse than having another decade of a good life.

Or perhaps even a broken hip that never heals is not too great. Now you won't just get dementia, but you'll do so while you can't even go to the toilet yourself even on your clear days.