One of the up and coming React DnD projects is https://github.com/clauderic/dnd-kit. It's still in beta, and the drag/drop animations are rough around the edges, but it appears to be targeting an enterprise-grade set of features, including accessibility support.

Its core + plugin model will likely be the closest you can get to bundle size minimization.

Until the situation improves, for production, I use react-beautiful-dnd.

Long term, I think this might actually be a good problem to be solved in web components (e.g., using something like Stencil), then output targets for React, Svelte, Angular, etc can be generated.