Universe Mode (how to play)

Universe Mode is by far what I play the most in-game. But it was so much better when I had a roommate to play and share stories with. I don't see Story Designer returning, ever. And an online Universe Mode probably won't happen.

It would be great if either did. Building stories just for myself gets pretty sad my the time May arrives.

I'm wondering with you guys here, do you have friends over to play co-op? Do you play it alone? Are streaming you sessions? How are people getting the most joy and longevity out of Universe Mode?