I quoted the article where it concedes the point. Usually a system is only coherent within a set of assumptions, in this case the assumption is people can't easily rejoin or see their placement. That maybe doesn't hold for physical lines but the example the article goes into is an internet service where people have no control or awareness over their place in line.

In any case, I'm just reiterating what the article says about this point, not sure what there was to disagree about.