D Borous
It Wandered In From the Wastes
If you prioritised it, you could totally have a game set 20 years after the bombs that featured all these desperate bands and what not and really go into their mindsets and how each of them survived in their own way. There wouldn't have to be any "factions" exactly, but there could be some ideas and themes to explore. But the priority of this game is rather focused on gameplay; specifically the settlement building aspect of Fallout 4. Plus, the fact that its multiplayer in nature means there really can't be anything like player choice or anything you might find in a proper RPG experience.