This is a fantastic, critical take on design systems by Rune Madsen. I found myself violently nodding along with a lot of the critical points made in the presentation, especially around tooling:

I find it really fascinating when I see some new blog post announcing a company’s new design system made in Sketch. And I cringe a little bit on the inside, because that project is going run into such problems when that design system is implemented in code, and there’s suddenly two sources of truth: Sketch and the code implementation. Then you’re suddenly faced with a situation where your teams have to do double work to keep the design system up to date.