It's not all just dignity, there's quality of life from the view of the person living with the illness/disability. If I were to "come round" from a bad one and find that I'm now bed bound due to something that happened during it, the quality of life has been drastically been reduced. That wouldn't for me be a life I'd want to be around for.
Telling the person with a disability/illness that you know better than them, about the impact on their daily lives isn't very dignified. It comes over as callous, unsympathetic and demeaning.
As a result of a series of a few "not so bad ones", including one where I was hit by a bus during it, I got a DNR put on record. So it's not always about letting anyone help us die, just let the body do what it wants, don't keep us alive. The money, since that is all that matters for some people, used to keep me alive could be better spent on others with a better outlook in store for them. There'd be no bed taken up, no assigned nurse(s) and no machines doing what the body should be able to do normally.
The last "not so bad one" had me looking like "something out of a cheap zombie movie" according to one person who saw me that night. Blood streaming from the head. I'd cracked the skull in two places and cut the head open in three, as I'd later be told.
It's not a visible disability for 98% of the time, but the 2% where it is visible can scare the hell out of some people. But it's what the majority base their opinions on, not the day to day stuff. The treatments that can't, or won't, be given because of the underlying condition.
Maybe we as a society need to stop telling those living with an disability/illness/condition that we don't have any idea how their lives are impacted by it. There's parts no-one will see, leaving just what you have seen to base your judgement on. If society wants to have their mind put at ease, because it's easier deal with, then maybe "society" has it wrong.