There are other games with server meshing, it was first seen in Ultima Online, they first coined the word "Shard" The world was smashed and made up of "Shards" of that broken world as a way in lore to describe a mesh of servers for individual instances.
Indecently Ultima Online was developed by Origin Systems, a Chris Roberts Studio, and published by EA Games who also bought out the studio and eventually killed it, they took the name "Origin" and applied it to their "$£$$% launcher!
It is thought this is where Chris's pathological miss-trust of large publishers comes from.
Anyway, many other games have since adopted the same technology, yes NMS and Planet Side 2 before that, the difference is in PS2 for example the messed servers are still separate from each other, you literally round a corner and dozens of people would *Pop" in to view, you step back and they *Pop* back out of view, this is the server boundary in a shard of meshed servers and you're crossing that boundary.
In Star Citizen the servers are not just meshed together in a single instance, a "shard" but they act as a single physical server, not only can you see the players on the other server you can shoot across that server and kill them, that is unique, that has never been done before and so far as i know not since, having said that CCP Games (EVE Online) have hired some of the people who worked on this server meshing.