It can be played singleplayer without issue.
And a single option just won't work, as we already have a single option for it, called NoCollaboration, but while a lot of people are fine with that, for others it's way too difficult. And for others too easy. The issue is that different people have different playstyles and like different things - we cannot provide one solution to rule them all, it's impossible.
No Collaboration is our singleplayer setting, most people are fine with. For those that are not, you can change additional settings to tune it to your needs.
And a single option just won't work, as we already have a single option for it, called NoCollaboration, but while a lot of people are fine with that, for others it's way too difficult. And for others too easy. The issue is that different people have different playstyles and like different things - we cannot provide one solution to rule them all, it's impossible.
No Collaboration is our singleplayer setting, most people are fine with. For those that are not, you can change additional settings to tune it to your needs.