I'm a big believer in guides. ShadCN provides great starting points for continued engineering as do other ShadCN libraries. For companies with the resources to, they do just start with BaseUI.

In the long run I think most UI will be BaseUI/RadixUI + Component and style guides, prompts, and traditional packages will no longer be relevant.

I mean, you are using BaseUI directly... The components on top live in your code base.