When ESO first came out it made sense to have one of each crafting station in each zone and then to have the same crafting station in each alliance.
Since One Tamriel, it makes little sense to have the same crafting stations in each alliance. New sets should be introduced to each Alliance zone that would be unique to that zone. The current crafting sets will remain, but scattered throughout the alliance zones, with no redundant crafting stations.
I mean, you still have to travel to discover specific crafting stations so why not add a little variety?