"I've seen Wall-E, THANK YOU VERY MUCH! Also, I thought I told you to wear proper clothes, young lady."
Like many things, this reminds me of Fallout 4 (for all its flaws, it's very absorbing. At least if you like settlement and robot building). In that game, you can take command of settlements, build them up, arm them, and effectively create patrolling guardians for most of the map.
Not only do I consider it a non-standard "win" condition to take command of enough of the map that all of it is protected by my patrolling minions--er, allies, but there's an argument to be had that most everyone on the map would be better off by virtue of you simply not progressing the main story past a certain point while avoiding certain missions.
It can be your game's canon that a certain faction never shows up, things never escalate, and though one arguably bad faction is still around, the world you create should really be set up to handle them at some point.
I mean, there's the issue of missing out on plot, but I don't actually like the main plot of Fallout 4, so... Really, I only get around to it if there's an item or something I want that depends on progression.