Why myth? I really don't get your dismissive response to the idea that, yes, there are great artists, and yes, they do create from themselves, and no, they don't do audience polling ahead of time.
I don't mean to be entirely dismissive, but I just have learned and feel that not one sentence in that paragraph was absolute, and to string them altogether that way is to make a myth of "the great artist." That's just how it is for me, I used to actually believe this, I no longer do. I don't always believe great artists are compelled to make great art, I don't always believe they always did so without input or reaction from "audience," I don't always believe they were ahead of all their audience.
This "great artist" thing has really made it hard for me to read a lot of biographies of artists.
You're entitled to believe so. if your learning and experience have led you there..