You're right, but are also ignoring that branding, appearance, etc., is simply not important to some people. They prefer function over form, which is where I think the author is coming from. They're wrong in thinking that most people share this opinion, and the idea of LLMs creating UIs seems awful to me, but as you can see from the comments here, this is appealing to some. It's niche, but this website is not exactly mainstream.

I partly share this opinion because most branding and UIs, products that are primarily marketed as a "lifestyle", etc., are obnoxious. Yes, appearance is a factor of anything we interact with, but when using technology my primary thought is if it solves a practical problem. Not if it's broadcasting an image, or even if it's enjoyable to use. The latter is important, but often companies prioritize it over functionality, which is backwards to me.

So starting with a mostly functional product, and giving me the choice of how to style it, is appealing to me. This is why I still use RSS, custom style sheets, the CLI and simple GUI wrappers, etc.

There is an audience for this type of product, but it's of the magnitude of a rounding error, so naturally most companies don't, and likely shouldn't, focus on this segment.