The issue with technology trying to be "smart" is that it's all nice and stuff as long as you are within the designed use case of it, but once you step outside, there's an issue. For example, what will the display do if you are a traveller and some other traveller approaches you and asks you which gate their flight is? If there were a non-personalized display, it'd be easy: you would just look up their flight on the table. Now all you can do is to tell the traveller to look at the personalized billboard. But what if they have bad eyesight and can't read it? Maybe also the angular resolution of the billboard is not good enough to show a different thing to them so it shows the same to you as it shows to them, which might be your flight, or might be their flight.

Another such example is the issue of deadnaming trans people. They will probably be not happy at all to see their disliked birth name printed on such a large billboard, even if it's only visible to them. If the name is visible to the people they travel with, it can cause even more issues.