Severance

I'm not suggesting they actually have some clearly thought out master plan that will lead to their happily-ever-after Innie world.

I think that's a key point - they're not really following a plan, they're improvising to survive moment to moment.

It's easy to observe them and say, "this isn't going to work, because x, y, or z," but from their POV they're just doing what they can.