This isn't a collection of ways to "build components for the web" though, it's a set of ways to build "web components" the W3C component standard that ships natively in all modern browsers.
Even those these components are built with different libraries, they are all interoperable and require no framework to use them, so I'd say this points to the defragmented future of web development.
You misread this post. The left panel has all the different popular libraries and frameworks that can be used to build a web component, including things like React, Svelte, Vue, etc.
I actually helped contribute to this list. If you look at the React, Svelte, and Vue, examples, they are specifically being wrapped as standard web components.
Even those these components are built with different libraries, they are all interoperable and require no framework to use them, so I'd say this points to the defragmented future of web development.