What they seem to be trying to do with the `Cross Server` feature is fix the brokenness of dying servers they have caused by constantly adding new servers and re-playing events that further widen the gap between f2p and p2p.
If they focused on finding a better solution to dying servers than just merging a couple per week and implementing better features/events, there wouldn't really be a need for cross server features, though it's nice to have cross server as it does balance out SWB.
Next thing we'll probably see is Cross Server GNW :lol