one reason it works with humans is that we have skin in the game
Another reason is that different humans have different interests, your accountant and your electrician would struggle to work out a deal to enrich themselves at your expense, but it would get much easier if they shared the same brain and were just pretending to be separate people.
Another reason is that different humans have different interests, your accountant and your electrician would struggle to work out a deal to enrich themselves at your expense, but it would get much easier if they shared the same brain and were just pretending to be separate people.