Wills have nothing to do with advanced health care directives. That truly is mixing apples and oranges. Living wills while you might think them nice are frequently over looked or not available for evaluation. The best thing to do is have an advanced health care directive in place that specifies treatment and NAMES aperson to have power of attorney for helth decisions
The booklet by the VA is broad based in its questioning for several reasons. The answers to many of those questions can lead the nurse practioner and doctor to diagnose PTSD, clinical depression, and other severe changes in patient outlook. Fact is that a lot of our older vets are depressed and do not feel that much in life is worth living for. The goal is to find a way to imprpove their conditions and support them so that things have meaning again
Apparently you've never seen a living will. You are making so many erroneous claims I don't know where to start, so I won't.