Thank you for sharing this awesome article! This validates everyihing my team is planning and our natural progression. We are soon moving into more of a support role so it’s great you mentioned how you’re handling that process.
As some of your last point of designers working with production components, we are leaning towards re-creating everything using web components. Check out what people over at Pega did with Bolt design system (https://twitter.com/salem_ghoweri/status/1012726200144482304) all built with W.C. and css vars.