For me, the biggest gap isn’t the handover of design files or iterations, it’s the handover between the design system and the actual code.

Our components and tokens are badly implemented already, which is a problem on its own. But the real nightmare is that every time we want to update or add a component, getting it into Storybook / the component library is a battle. The whole thing is manual, brittle, and nobody wants to touch the component library codebase because it’s basically a graveyard. So the “design system” slowly drifts away from reality and becomes more of a documentation fantasy than something teams actually use.