Do you have any examples?
I couldn’t find any pictures so I had to recreate it, but last time when I traveled through Gatwick they have a configuration like this (I’ll explain more under the picture):
My plane parked at stand 1 (right of the picture) and I had to walk through a corridor passing by other gates. The green arrows are the PAX flow from stand to exit and the small red arrows on top of the doors means that those doors are one way.
With this configuration, when people goes from the gate seating to the jetway, they have no other way to go other than the jetway and the people leaving a plane can only go to the exit. I should say that as I was walking through those gates, they were all closed, and I assume that when one gate is open, the corridor doors are probably locked, so if you are at stand 2, for example, you cannot take the door to the left and go to the baggage claim.
What I’m trying to say with all of this is PLEASE, PLEASE I really need one way doors in the next update. I haven’t play the game since July waiting for one way doors. PLEASE!