I'm very curious about that. It sounds like the kind of thing which is done just because it can be done. But in doing so adds a wast amount of complications and

I'm very curious about that. It sounds like the kind of thing which is done just because it can be done. But in doing so adds a wast amount of complications and makes everything very error-prone (as you say). What is the purpose of passing separate parts of the control to separate stations? When is that useful?