I suspect it has something to do with a) The programmer not actually using the software they create. They end up spending time trying to understand the domain.

I suspect it has something to do with a) The programmer not actually using the software they create. They end up spending time trying to understand the domain. b) The programmer uses the software they create and wants it to do everything (see also Second System Effect, Zawinski's Law/Law of Software Envelopment). c) The programmer expects components to work as documented.