At Bleeding Cool, he said:
"I’ll be as hands on [with Agents of SHIELD] as I can. I’ve stocked it with writers that I know and respect and trust because, obviously, I have this other film that I have to make. It’s going to be on a case by case but I’ll be in every story, every cut and all of that stuff."
With Avengers sequels and Guardians of the Galaxy still ahead of us, clearly Joss is going to be pressed for time. Do you think it matters?