This is a useful and welcome change, although it does occur to me that the location of the new 'Neighbors' tab may cause many players to fail to notice it, either at first or even at all. This is not only because the new tab is located on a different screen from the game's existing interfaces which involve the Neighborly Help 'Hands', which most players are obviously accustomed to use when giving NH, but also because I, for one, would certainly not look within the 'Province Overview' tab to find a new way of visiting Map Neighbours (even though there is a certain logic to it - if one sees 'Provinces' as including not only 'places to Fight or Cater', but also 'locations of Neighbours' Cities' - which most players generally don't).
It would be a real shame if this helpful new feature were to go unused simply because it is hard to find, so I would suggest a prominent Post Horn-type in-game notice announcing its addition, with a brief description of where to find the new tab. As is well known, only a very few players ever visit the game's Forums, especially if they are playing on mobile, so the usual Forum Announcement of this change, when it goes Live, is probably not enough.