This sort of library probably should be communitized so there's really just a single library.

I agree, it would be great to join forces and speed up development... Svelte really needs one safe material library option.

The React OSS component community is fragmented. You will find both standalone components for a specific problem, as well as and a growing number of component libraries, with a wide range of API consistency, a11y, bug density, performance, bundle size, quality, and support.