When I was a child and I was upset about something, my mother was not capable of containing that emotion, of letting me be upset but reassuring me, of just being with me in a calming way. She always got in a flap, so I not only had my own baby panics, fears and terrors to deal with, but I had to cope with hers, too. Eventually I taught myself to remain calm when I was panicked, in order not to upset her. In a way, she had managed to put me in charge of her. At 18 months old, I was doing the parenting.
Would you take a billion dollars, if as part of the deal the Earth were made uninhabitable a year after your death? ... well, of course not; you care about your friends, above all your children, any grandchildren. But ... what if the deal calls for the planet to be poisoned a thousand years later? We feel strong obligations to generations in the near future - should we not feel the same way about our children's great-grandchildren and generations beyond them?
I think you can write very good comedy without a partner, but what I love about it, working with a partner, is that you get to places you'd never get on your own. It's like when God was designing the world and decided we couldn't have children without a partner; it was a way of mixing up the genes so you'd get a more interesting product.