A 'final call' is a powerful instrument to motivate passengers to go to the gate. Not so long ago I was having a beer with a business partner at a bar at a 20m passengers airport. When we read the 'go to gate' information on the FIDS screen we swung down the beer and moved to the gate. Upon arriving at the gate they announced the final call for our flight. We were glad we had made it in time.
However, looking outside the windows we saw that our aircraft only just arrived. Even with zero turnaround time, the departure would be late. The only options we really were left off was to sit/stand at the gate and wait until boarding started or walk back all the way to the bars where you would not get further information because there had already been the last call.
Would you trust any information displayed at that airport?