A lot of single-player (not online serviced) computer games could be regarded as ‘completed’: once they’re out on the store shelves, it’s pretty much done (although with the rise of Steam and continuous updates this is less of a case)
That’s probably why many game programmers are more pragmatic in their programming practices: they have a concrete deadline to pursue, with a predictable subset of hardware for their program to run...
point taken, a lot of software in the pre internet era could be considered completed - on the other hand there's always still going to be issues, so you could also claim that these projects are just abandoned.
In general I think software is more like a house than an art piece - it keeps adapting as long as people use it.
Strike the "large" in that sentence. I somewhat think that writing software is like painting. At some point you decide to stop, but you're never truly done. Also cf. Leonardo da Vinci: "Art is never finished, only abandoned."
