Any server would just be to pair players with rankings and etc. Nothing to do with the actual game connection.
Well... We'll never know exactly what the problem is, but we can all agree that MKX Online is garbage.
NetKode, Servers, whatever... cannot explain how me on wired VS a friend on wired with the same [or different] hosts [tested both] can be playing at the same non peek hour times, and get different latency on different sessions. Even within the same hour, like creating new rooms to see if we can get an improved connection.
And... If servers are not a factor. Then why did Ed Boon [I believe nothing he says so this isn't really relevant] say the cause of the issues was due to more people on than they expected. P2P, that should not matter right.
Bottom line... We will never know what's really causing the input lag [sure it's multiple things]. But... NRS/WB know exactly what it is, and exactly how to fix it, but choose not to for [insert theory here]