[Lizard]

Yes. Whether a project is sequential or parallel, it has a single 'next action'. This is to help people like me. I _could_ start with almost any task in 'Clean the House', and might get side-tracked analyzing whether it's best to start with the really icky chores, or maybe work from one end of the house to the other, or do the little things first so I feel a sense of accomplishment, or ....
OmniFocus says (in my head) "I know there's a lot of things you _could_ do right now, but don't worry about all of them. Here, just do this one, and then come back and we'll talk about what to do next."