"In the GNU project, man pages are secondary. [..] It’s your choice whether to include a man page in your program. [..] consider that supporting a man page requires continual effort each time the program is changed. The time you spend on the man page is time taken away from more useful work."
MORE USEFUL WORK?!?!!!!
I can't think of much in our IT world that is more useful that good and accurate documentation.
https://www.gnu.org/prep/standards/html_node/Man-Pages.html
(h/t giulianopz)