Popular in the 70s and the 80s, choose your own adventure books tailored the outcome of the adventure to the reader. These books appealed to those who wanted to set their own direction, but needed structure.
Too much of end-of-life planning is open-ended or overly prescriptive. It also focuses on the destination, rather than the journey. This opportunity suggests a different course of action, where the individual is allowed to create a custom plan among well-defined paths.