Just got into a conversation with my dear room mate, Ivan, here in Bilbao at aKademy about this.
My personal opinion seems to have leaned towards preferring to not have to write them myself. Rather, I am happy to have them generated by a util, for instance during the build process.
A real life example could be rustdoc, most probably. I also realize that it is a bit of an unrealistic wish at the moment, but as I am on vacation now I am entitled to dream a lot. ;-)