We appreciate any thread with suggestions for the map of the regions our game cover and as always I follow the discussion with interest.
However we are not at this time looking to improve the European map. 1.20 will focus on east Asia.
If/when we do touch up Europe again we will revisit all threads like these for inspiration.
That said I also want to mention the Low Countries and the Rhine area currently have the highest province densities in the game. In some cases the reason we don't cover certain things is that we don't believe we have space to do it in an acceptable way for vanilla. The map is this games most important interface and needs to be clear enough to read and clickable enough to use in all places.
This is why we have never added Jüllich for instance. Much as I'd love to see it in the game.