The 90s demoscene was a fascinating confluence of engineering, art, and informal competition.

If you've ever been to a makerspace, those places tend to be ground 0 for engineering as art.

I would never consider any functional piece of software or its source code art. Something like brainfuck language and programs in it can be art-adjacent to me, but they don't fall under functional.

Some buildings are works of art, but there are plenty that are clearly not. I doubt anyone considers a typical big box store or a commieblock art. To me, all functional software is equivalent to a mass-produced building on art scale.