As an example, I've tried to get it to draw architecture diagrams, it draws a few boxes but then places the strangest text on those boxes.
Art is probably the best use. The "filler images" and other miscellaneous background art that adorn lots of articles aren't really expected to be 100% accurate or even worth looking at for more than a moment, and I think this is where AI-generated art will mostly fit.
It's useful for brainstorming ideas. If you need a cover for a book about Business Bears, you can quickly evaluate many variants, especially if you're not quite sure what you want, and you'll only know when you see it.
Inpainting, etc. with SD and control net is really handy for image editing though. You can make changes in seconds that would normally take a professional hours in photoshop.