It is possible to make a menu with actual Regions in it and show it on Frontend. But this has to re-constructed everytime a change is made.
It would be nice to have some Gutenberg-Block to put on a page with a list of all actual Regions, perhaps with a count of entries behind it.
A simple UL-List would be great. This way you could show all Regions with Content (Listings) in it as a Tree, with the help of a little bit of CSS.
There could be another Gutenberg-Block that shows all Regions in a Tag-Cloud (for example to put it in the footer of the page).
This would be great to have