I see nothing wrong with writing a book. In fact planned from the start to do so for every project.
Folks talk about the importance of "documentation" before the fact, but what is more valuable than documentation after the fact? Info about how the course was built and why it was built so? Decisions made, thoughts, photos and the like.
Many clubs today would give a small fortune to understand what the architect did, what he was thinking, what direction maintenance should go, what should be avoided, things that may not have been accomplished, how the course should mature, when that maturation process has gone too far etc. A users manual for the club's reference, superintendent's reference that would serve as a road map decades in the future, and through the revolving door of committees.