Visual creativity requires experimentation - trying things that shouldn't work, and teasing out some measure of emotional or intellectual interest. Systems that are increasingly only capable of outputting marketing visuals are caught in a blandness spiral. They're just going to get worse, so long as they filter out all the weird things artists might actually want to generate (six-fingered hands, off-center subjects, nude bodies). Imagine training an artist solely on magazine ads, or only allowing them to produce that kind of work. No figure drawing, no sketching from life where a pen slip produces a unique texture that becomes a signature element.

I say this as someone who's generating smut-adjacent, art-adjacent images almost every day. It's amazing what image models can produce, but (as with my traditional skills) they'll always be held back by a refusal to embrace holistic study of the world. Sometimes you gotta draw a lamp or weird sculptures or a vacuum cleaner or a dick. Sometimes you have to paint an empty sky or a nipple and do your damnedest to find an epic novel in them.