Oh refreshed, I am so very sorry. Please accept my deepest and heartfelt condolensces.
This is another eye opener. No, you are not being legalistic at all. A Living Will should definitely be binding. That's the purpose, if one cannot speak, the person's wishes are there in writing.
And........ I was thinking the exact same thing before I read your words........ If a loved one didn't want the burden of caring for their ill relative, well........ viola! Here was the out.