Look, you play the game, with someone, anyone. Since this is a co-op game, instead of a quake style start-new-match thing, you will presumably want to continue the game where you left off last night. Presumably with the same people (ie, your friends). So, it doesn't matter who has the save.
I mean, hell, Alien Swarm doesn't even have a proper save system (or loot for that matter) and no one cared.
BTW, how exactly is the game boring or pointless?