Sign if you would of Prefered this over the data Center shuffle

[Adrestia]

BDO is two data centers; one for NA, one for EU. If you make a family on one, when you switch over, it'll prompt you to create a new family name, meaning it's not interchangeable as your statement would lend one to believe. The other "servers" in BDO would be called channels/realms/shards in some other games, like TERA. Adding a new channel/realm/shard isn't nearly as costly as adding a new server or data center, but is meant to split the player-base apart to avoid things like overloading the server. BDO's servers are all of the regions (Olvia, Velia, Balenos, Serendia, Mediah, Calpheon, Kamasylvia, Arsha) - they share certain chat features when you are within that server. The shards are numbered (Calpheon 1 is the first shard of the server Calpheon; Calpheon 1 to 6 will share the same server chat, but when you switch to Mediah, you stop hearing Calphone's chat and gain access to Mediah 1 to 6's instead). World chat broadcasts over the entirety of the data center.

FFXIV is devoid of the shard-server model; the server is the channel/realm/shard.

Links are what I'm greeted with when I pick between NA and EU DCs in BDO.

This is disingenuous. The shard model (devised by Ultima Online) is literally what FFXIV has. What FFXIV calls a "server" IS a "shard." For what matter, what FFXIV calls a "datacenter" is a "cluster" or in WoW terms a "battlegroup."

In MMO terms, server/shard/realm are all literally the same thing. A logical server comprised of many physical servers that in the end give you a game world you can play on.