The "Advanced Medical Directive" has always been a moving target. It is versioned by state in an attempt to go unchallenged. Some 1st responders have been known to discard it if found on the person - it is legally binding if signed and witnessed properly.
End of life is covered since it can give Power of Attorney for (medical procedures only) to another person named if the card holder is incapacitated. There have been endless legal objections by non-JW family members over the decades, but the courts usually folllow the decisions of the cardholder.
I am a firm believer in making my own end of life decisions so I don't object to that section at all. As for the stipulations on blood, it should be a personal decision made by the cardholder without any pressure from congregation elders, family, friends or HLC. Many JWs prefer not to carry the card because they disagree with the blood doctrine altogether, but are afraid to speak out. As a result, they often get no say in the decision-making if they lose consiousness before they can express their wishes.
In the near future, I expect the AMD (blood card) to metamorph into something more akin to a simple DPA with little or no mentioon of blood and fractions. It would be the smart thing for WTC to do.