What problem does this address?

WP 6.7.1 empowers the creation of custom binding sources and the binding for blocks Header, Paragraphs, Buttons and Images.
That covers a lot, but some common text pieces are missing. The list items.

What is your proposed solution?

The structure and features of List items (core/list-item) share lot's of common with Headers and Paragraphs. So it's probably not a big effort to make it work.