It does look like artist names have a significantly reduced effect.
All these models are pretty good as that community is strong on art, styles, art skill, and tagging, causing the models to be a serious test case for what's possible. The model with artist names was indeed capable of invoking their styles (for instance, an artist with exceptional anatomy rendering had it translate into the AI version). The more-trained model without the artist names was much more intelligent. It was simply more capable of quality output, so long as your intention wasn't 'remind me of this artist'.
I think that's likely to be true in the general case, too. This tech is destined for artist/writer/creator enhancement, so it needs to get smarter at divining INTENT, not just blindly generating 'knock-offs' with little guidance.
What you want is better tagging in the dataset, and more personalized. If I have a particular notion of an 'angry sky', this tech should be able to deliver that unfailingly, in any context I like. Greg Rutkowski not required or invoked :)