Which types of designers? Because by the way you said "artists" it seems you're referring to graphic designers not UI/UX designers which, while they may make pretty websites and apps, are not artists and the article explicitly says to not treat their artifacts as such.

The website is a tool to get customers and most designers do not know marketing, scaling or growth engineering because it's not their job to know, it's the marketer's job to say, let's add an onboarding flow with these features and the designer collaborates with them on what it should look and work like.