I use nanobanana 2 to test changes in paint and flooring/tiling to great success. And the real pro move is taking those images to a designer to tweak the remaining 20% or so.
You just described how people are using AI in general. And I think that last step is actually a huge gap. People will brainstorm or improve their understanding of the task with AI and create something. Ideally they would hand it off to a professional for finalization like you did.
I wish a service existed where I could make something in AI (text, images, whatever), then pass that AI output to an actual human who would use it as a guide to produce an actual product.
I used it recently to explore a few placements of a pool and glass building on my property. It's not authoritative, by any means, but it did answer some questions
And at this level it's barely any different than an architectural render, more for "how could this look" rather than "how will this look"