Fallout: New Vegas is really about Domination, in the political sense. All the Obsidian games are, Pillars, KOTOR2, Outer Worlds, and yup Pentiment, all of them about are about domination, but in New Vegas it was explored with the factions of Caesar's Legion and the NCR. That makes them interesting games, "Domination" as a concept often doesn't hit quite in the sweet spot for me in political concepts but it's still makes for good storytelling.
Bethesda saw that people really liked New Vegas and so in Skyrim and Fallout 4 they figured "oh people really liked this faction stuff, let's create factions with a cool gimmick" so you get the Stormcloaks vs Empire and Minutemen vs Institute, the thing with these is though that they seem to be mostly cosplay and theme park and maybe some vague idea of a child's version of "freedom?" They have trouble making these factions appear stand for something, they don't seem to understand how to do it.