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While I agree with the point you're making

> there is no such thing as a separate gate for arrivals

You might be surprised. In many of the newish airports I've been to (outside the US) the gates are designed such that arriving and departing passengers for the same aircraft never bump into each other.

They do this by clever design; immediately after exiting the aerobridge and onto the terminal building, there's a split (staircase or a sloping walkway) of some kind. So, the departing and arriving passengers are on different floors.