I had a conversation about this with a friend yesterday. What I would like to understand, is what the difference is between one incurable terminal condition an

I had a conversation about this with a friend yesterday. What I would like to understand, is what the difference is between one incurable terminal condition and the next is, and why we're culturally stuck on trying to divide things up into "approved" and "not-approved" categories. Death happens for everyone. Most everyone, if they make it to very old age, will have degenerated physically and mentally from where they once were. I wonder, if our sympathies are telling us to consider whether a person with X condition should be allowed to end their life, whether that same thought process shouldn't consider all end-of-life conditions to be equal, given their shared terminality and expectation of degeneration. Or, on the flip side, should we think terminality and expectation of degeneration in these cases is not enough, whether it is appropriate to accept it in this subset of cases.