The idea is really cool as a proof of concept.
Additionally, it could be cool for one off pages.
However, I would never use this on a real project since having a design system is a requirement for any project I work on. With a lot of UI component libraries gaining traction I would have to use a bespoke component which does not really adhere to my design system.
Of course this might be added in the future and the fact that it already uses tailwind is a great step towards that but until then it is still a cool tool to get inspiration for some screens.