It's not just about finishing it faster or slower. The open world environments change how the game is designed. The design has to be less linear, less exact and account more for player decision. Adding multiplayer elements to the game has an equal if not greater impact of making the experience less personal, less linear and more generic.
It's just not the right design choice for every game, despite the fact that this is the design trend.
It's just not the right design choice for every game, despite the fact that this is the design trend.