The ONLY way that they've been able to sell this to fliers is that it gets rid of the existing process, and maybe some time soon we'll be able to keep our shoes on.
If they now make this sequential, then it's twice the time, twice the staff to manage, and twice the inconvenience -- you now have people queueing up between the two screens, passing one and failing the other, etc.
If they now make this sequential, then it's twice the time, twice the staff to manage, and twice the inconvenience -- you now have people queueing up between the two screens, passing one and failing the other, etc.