First of all, some people are slower than others.
Second, now that we've progressed into the game some more, there is much more interaction between characters. Fingolfin, Ancryx, Tobias, Jarrod, Saepiroth, and Icitrik are all the area fighting each other, and thus they'd probably want to see exactly what the characters ahead of them do. And characters that aren't directly involved still have a vested interest in what happens.
So most players can longer submit actions in advance and expect things to go well.