I think with artists specifically, a large part of creating something is effort that is not readily apparent. It happens inside the head, so it looks like "nothing". And when something is actually being done that other people can see, it looks effortless (with thousands of hours of practice/learning spent to "get there" being in the past, as is any conceptual work done), so people just conclude that it happens "on its own".
It's not exactly an artistic endeavor per se, but if I got paid for listening to every annoying person I've met that thinks translating things is basically just "you know a language passably well, and you just type for a while and the translation is done", I wouldn't have to work as a translator in the first place. I dread to even think what BS actual writers have to listen to.