Here's a picture of the super cool internet backbone that you get routed onto to get to FFXIV after the NA datacenter move. ...notice the lack of well...anything...in the middle of the US. If you aren't around the west coast, east coast, or south, you have to depend on your ISP to connect to their ISB backbone in a hub city to connect to one of NTT's networks to get over to San Jose, CA where the NA datacenter resides.

If we had more details on what other backbone networks looked like (and their availability), then I could help show you a visual map of where a connection goes. But chances are, unless you live in California or one of the hub cities, any major providor having an outage means you'll end up having a bad time getting connected to FFXIV. Services like Netflix or Amazon or Twitter can get around this because they're spread aout across multiple regions and also usually pay the peering costs to get beefier connections to important places. ISPs like to travel on their own stuff, after all.