If the “direct line” is theoretical anyway it just doesn’t matter anyway.

I don’t have any citations sorry, but I did look into this about 15 years ago for reasons I no longer remember, and what I learned is that in most places with large overall populations that uses a system like this, and where leadership is not voted for independently of local representation, the representatives overwhelmingly vote along party leadership not on the community they represent.

Not sure I’m explaining it well sorry