Why, oh Why, oh Why do I bother telling pax the boarding time, only to have them turn up late to the gate stating "oh, but it doesn't go until XYZ time and now i've missed my flight." As the a/c pushes back into the distance!!!
The boarding time is to help us get everybody to the gate on time and then commence a smooth turn round without having to play the bags or pax first game.
sorry about the rant but there it is!!