alt Hacker NewsAccurate detection in individuals is still important for testing any potential cure. Otherwise you can only do normal population studies over a very long time and pray that you didn't miss on any confounding variables. With this level of accuracy in diagnosing, you can do targeted testing.
While that is true, it doesn't change the sentiment behind “We have no cure. I don’t want to know.” if knowing the diagnosis doesn't help you personally. Sure you might have a sense of responsibility for mankind but you still know you can't do anything to save yourself.
With that said, lifestyle changes can slow down the onset of Alzheimer's, so knowing the diagnosis isn't totally useless.