Why does the so called "Content Finder" (aka Dungeon Finder) have to be cross server? Why can't we use it only for that server so that it doesn't destroy the community?
Obvious answer is lower queue times and much larger pool of players to pick from and this easier for the matchmaking tool to make a group with the correct levels and class roles. How does it destroy the server community when people on their own server don't really do anything outside their own click of friends?

Why do they have to for the WoW version of PvP and not use better version of Ballista?
Ballista was terrible and nobody played if after the initial couple weeks. Having an contested battlefield area where different factions or companies in FFXIV's case fight over is pretty standard in any MMO now.