While I agree, I think there's an important caveat that is missing. To me, digital art needs to be self-contained. Digital art, unlike physical art, doesn't really rely on anything else for it to present itself. It's why digital media has standards. A .jpg should, in theory, be self-contained and only require a device to view. A game presenting itself as digital art, however, needs to be tied to a specific platform and software that may not potentially run in the future for any number of reasons. It needs to be feature-locked and self-contained so that it can be archived. To try and compare modern/older art to modern/older digital art isn't fair or equivalent, in my opinion.