In this forum, we have long mourned the passing pf the 'flik-flak' boards. They were large, readible from far away and, each update brought a cascade of noise - so folks knew that there was an update.
But, vertical monitors are difficult to see from a distance and do not announce any change but they are cheaper - so of course they now dominate. If they would like people at the gate on time, perhaps have a 'flik-flak' board. I think it was an italian design.