Hmm, I feel like in my job I write a lot of things that no one ever reads (issue notes, extra commit information, comments) with the expectation that it'll be helpful information if I or someone else ever does need to look to figure out why I did something.

And it has been helpful. I mean maybe about 1% of it is read later at some point and helps clarify a situation. 99% of it is never seen again. That 1% of the time it's really helpful to have it.