See this article for example: https://darekkay.com/blog/accessible-ui-frameworks/
Maybe it has improved now?
Knowing and remembering shortcuts for every webapp you visit is impossible for anyone one person. Photoshop has its own shortcuts, so does Sublime Text. Open VSCode...oh yeah, you can map Sublime Text keymap but it has its own as well! Then you're SSH into a machine and you have to use vim.
Keyboard shortcuts across apps needs to be standardized in some kind of an ISO standard. It is only creating noise. I don't want to remember Pintrest shortcuts or Twitter keyboard map. Ok, its good to have them I guess if someone needs to learn it and its not necessary to use the app - so that's good. I just think that some of these shortcuts are all over the place.
All of our components are built for keyboard / screenreader support and accessibility was one of our primary goals since the beginning. We take it serious and it's baked into our review process. It's fairly mature and is now two and a half years old with a solid team working on it full time. At the very least you might find some ideas for your projects. It's also TypeScript-backed and themable through a Sass layer with native dark mode support.
We welcome contributions and if there's any students out there thinking about hacking on a component library for summer of code you can find some projects over here[3].
Other projects out there similar to ours that are pretty mature are Microsoft's Fabric[4] and Atalassian's Atlas Kit[5]. Both of which are open source as well. Generally we tend to have more features, and they might be a little easier to theme or modularize. Chakra UI[6] is a new comer that is smaller, but people seem to like as well. There are a lot of options these days and most of them are tailored towards a certain use case, since it's hard to target everything.
I research this stuff a lot so if anyone has any questions about component libs give a yell.
[1]: https://github.com/elastic/eui [2]: https://elastic.github.io/eui/#/ [3]: https://github.com/elastic/gsoc [4]: https://developer.microsoft.com/en-us/fabric#/ [5]: https://atlaskit.atlassian.com/ [6]: https://chakra-ui.com/
I'm intrigued by Tailwind UI though, it looks like it might be the right balance between feature set and brand agnosticism.