[bthornbury]

My first thought was that this is a UI Framework (Evergreen) built on UI Framework (React) built on a UI Framework (js + html).

No real point here, but I do find it curious that there is this tendency to build new UI frameworks all the time.

Personally, I still like html + js (and I have used React).

[deltron3030]

3 Different things. html, css & js are like raw materials, React is processing these raw materials, and a UI components or design systems are the result you get if you mix the React process with manual labor.

The're frameworks and design systems. A React UI framework refines or enhances the React process to build UI components or design systems.

Bootstrap e.g. is 2 things in 1, it's a process/framework and design system that sits directly on top of html, css & js.