Coming from a tabletop gaming background, I kind of view Fallout 4 as a really great campaign sourcebook: Huge game world, a solid group of notable NPCs, a bunch of factions and towns with complementary and conflicting goals, tons of little details and side-quests and locations to explore, great artwork. But it really needs a good story and much of what directly involves the players and their characters is left unfinished, which would be deliberate in the case of a tabletop RPG sourcebook, because the GM and players would be expected to fill in the blanks. In the case of a CRPG, some mods have filled in a lot of those blanks, but there's a lot modders can't do, so the game is just kind of left unfinished. I presume whatever New Vegasy-type game comes next won't make use of what's been done here, but will start from scratch with a new setting and factions and everything, and The Commonwealth will just be left to rot.