In many ways, it is a zero-sum game. Art is a form of communication, and people have a finite amount of time and attention. Some people enjoy seeing the craftsmanship of artists, and some artists enjoy displaying their mastery of the craft. Beyond that, people use craftsmanship as a proxy for care/thought put into a work. If you can successfully mimic the appearance of craftsmanship without the effort, a major incentive for artists to create, polish, and publish their work is now gone. If you're someone who enjoys viewing craftsmanship, or who tries to find for high quality work based on the craftsmanship put into it, how long will you be willing to look through a sea of increasingly convincing noise to find some kind of signal?