That's why the main quest is always one of the least fleshed out aspects in Bethesda's games: because that's not the point. The whole premise of Bethesda's open-worlds is an invitation to go off your path and be curious.
Bethesda always give you these big landmasses full of secrets and places for the player to discover. Fallout 4's focus (as in nearly every other open-word game by Bethesda) is on exploration and sense of adventure.
For me, it's like comparing apples to oranges.īoth are open-world games, yes, but that's it.