I personally just finished writing one note. I feel that my past speaks for itself and that writing multiple notes, in my situation, is pointless. I feel that, for some people, writing multiple notes, a few notes, one notes, or none are a personal decision. Maybe all you want to do is write a quick note for the first responders so that there's no confusion - that you were of sound mind, etc. Or maybe you wish to explain to people - your loved ones for example - why. Or write F-you letters like I almost did before deciding on my singular note. I think notes both are and are not helpful but it's really a personal decision as there's no right or wrong answers. I hope you come to a decision that you are at peace with.