It's not just about separating lookup and connect: the fundamental stream abstraction is a point-to-point connection. It's possible to construct one-to-many con

It's not just about separating lookup and connect: the fundamental stream abstraction is a point-to-point connection. It's possible to construct one-to-many connections on top of that, but it adds a lot of complexity on both sides. Doing it the other way around (emulating one-to-one connections on top of a one-to-many abstraction) means burdening simple connections with a lot of unnecessary complexity.