True, super valid point but a technical programming book would not be a great way to be remembered after you died. The technology/library/stack/language you're writing about will probably die before you do or otherwise mutate beyond your book being useful.

I doubt that I would see "Here lies Fred, he wrote the greatest book on Fortran ever written" on a tombstone.

Or "Justine, her book on JQuery changed the world" in an obituary.

For a "heritage" book the topic would need to be longer lasting.