What business value does a design system offer? A common design language allows your team to create products in a scalable way, allowing you to transcend platforms.
What is the user value? Keeping features synchronized takes significant effort, the same work to be repeated across all of these platforms, allowing for a consistent product experience.
I've been a design lead for the Nickelodeon Design Systems team, focused on audits, organizing, animation and accesibility. More recently, I've created a shared component library (using DSM) for Saks and Hudson's Bay.
Let's walk through some learnings amd highlights from my past experiences.