As others have said, this is exactly what many large orgs do, but in a slightly higher-tech / more polished way with tools like Storybook, essentially creating their own CSS libraries and component libraries.
IMO a decent analogy is that Tailwind is to the above as something like Shopify is to being large enough to build your own ecommerce platform from scratch.
IMO a decent analogy is that Tailwind is to the above as something like Shopify is to being large enough to build your own ecommerce platform from scratch.