[jcelerier]

Some software is made to solve constantly-changing problems and thus constantly evolves too. If the software does not evolve to follow the world, then it does bitrot unlike what Dijkstra asserts.

Anecdotally, I've seen software being developed for the sole purpose of an event that would last a couple hours, software whose client needed it for the evening when calling in the morning, etc. It's a form of bitrot too: the code, event-specific, is as useful to us as the memories of said event a couple years in.