“You can have played for a hundred hours. I can join you on your game and if I collect stuff or do stuff then I have that and that’s in my save when I go back to playing single-player.”
The ability to experience the world alongside other people is turned on by default. Players can switch it off if they want to be truly alone, but the way Murray explains it, having it enabled won’t suddenly lead to those strange agglomerations of player characters you see in MMO questing hotspots.
SINGLE PLAYER CONFIRMED TO STILL EXISTS! I am so relieved.