Originally Posted by brp
Unfortunately, this further underscores the OP's point. Even though you are correct here, and the BP checker wrong, said checker thinks you don't belong there but will, in the end, let you go anyway. It seems that the people who truly don't belong get this treatment as well, and just go where they choose.
You're right, of course. I don't know what the answer is, some airports, eg SEA, seem better at turning people away, but again, as
observer says, that's in a situation where pax are met when first attempting to access the line, not at the front.
I'm not saying that it's entirely a design thing, but good design might be one way of compensating for disinterested, illiterate, grunting-rather-than-speaking employees.
Of course then we run into problems of terminal layout, available space etc.