I don't have much other MMO experience but IMO the responsiveness of FFXIV is pretty lacking.

I play at 30ms just 600 km from the data center. I still have to use a VPN because anything over 10ms makes the input delay almost unbearable for me.

I think the example of having to pass debuffs is great because you are relying on the connection of two players on top of the update speed of the servers which really amplifies where the servers are lacking (update intervals)

I will be really interested how things will be when the EU servers go live. Hopefully SE can crank things up a bit when the subs are spread out over an additional server.