If Fallout 4 could have a proper leveling and dialogue system modded back in the core RPG tools would be there for other modders to pick it up. Nobody wants to mod the other parts because there isn't a big enough audience. Like what happened to the boom towns out west. All the other services and industries that go into supporting the workers and supplies of the main one go with it. That in turn is similar to removing the main industry of a town. It would have been alright except the things have been hardcoded to the game so modders can't take them out.
The leveling and dialogue systems were abysmal failures to the point where Todd Howard himself had to admit it was a mistake. It's too watered down and mediocre at all the gamer types it tried to appeal to for any of them to enjoy it. They pushed their streamlining too far for even many of the casual players.
Bethesda put the longevity of the game to death before it was even released. The game is boring rubbish, that looks half assed in everything that went into it. Fallout 4 however is even more of a piece of shit. Even though compared to past games even Skyrim has a lot of bullshit hardcoded things stifling creativity, it's graphical and tech improvements over the old ones are too much to ignore. Currently modders are sticking to Skyrim Special Edition, which makes sense.
