Supernova V4 VS The New WordPress.com

I think supernova.io can help you out with having proper documentation that doesn't interrupt the workflows you have. You can now create documentation that is dynamic and connected to your sources of design truth, and that truly reflects the ideals of your design system. Source: about 2 years ago

I think the answer to all your questions is supernova.io. Source: over 2 years ago

Check out supernova.io we have made the delivery automation super easy. Supernova allows you to seamlessly export code and assets automatically from your design system when data change, with you being in full control of the process at any point. For example, you can open a pull request with new assets every time a new version of the design system library is published in Figma. Source: over 2 years ago

The WP dashboard can, and has been rewritten in React, see Calypso, but it was rejected by wp.org community at the time (likely for the reasons you mentioned). Source: over 2 years ago

The wp-admin dash itself will likely move to React in the far future. It's a big undertaking, and not a priority, or even wanted at this point by the wordpress.org maintainers and community - wordpress.com already has a React powered dash that even predates Gutenberg, calypso, and the open-source maintainers rejected using it as its not suitable for their developer audience. Source: over 2 years ago