DeadYorick: So playing the main campaign in Arcanum co-op would require walking across Arcanum's huge world physically every time, and having to deal with the terrible real time combat system
Yes, I knew this. But I also thought that it was actually impossible to run the main campaign in coop anyway. As in, it's not even an option in the game. I thought multiplayer only works with the modules made with the editor.
Also, my understanding of the real-time and fast travel systems was that with multiple players, there was no easy system for switching between real time and turn-based combat, or for "skipping time" through fast travel. Let's say one player is walking around a town and a different player wants to fast travel to a different town, you can't have the second player suddenly jump 2 days ahead, while the first player is still hanging around the first town 2 days in the past. And if the first player enters combat, would every other player who's elsewhere in the world have to enter turn-based mode too?
Interestingly, I hear that Divinity: Original Sin manages to solve these problems to some extent, allowing real-time exploration and turn-based combat to work together for two coop players. I haven't played it myself yet though.