The world map is sadly a problem Blizz dug themselves into, with no discernible way out short of just a retcon of the ingame world map. Personally i am for making the continents more true to their real size, though i suppose for ingame purposes the system we have now with all continents being the same ingame to map scale.
I will be very salty if Blizz does not give us a proper interactible Nazjatar on the world map. I could accept it with Argus since it would have been annoying to swap back and forth, but BfA already has that problem with having to change between KT and Zandalar.
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I would like to think that Nazjatar being an interactible icon from the KT map is just a QoL feature at the moment, what with there being no other way to enter the map beyond going to Nazjatar and opening the map. Mechagon is also not on the world map next to KT even though it should be, so i assume Blizz has just not finalized the new world map design.