the thing here, is that the coach don't watch really the time for substitutions, like in rl and that there are less breaks in the game(few to taken, less technical failures(out of bounds etc).
So sometimes the starters are tired in the last minutes, and then they got onto the bench, the time they come to bench can vary through the oppurtunities to substitute before. In the endgame indeed the coach even takes timoeout to give tired players an extra rest(a bb quote long time ago).
And at the starter, point two till one minute till the end, are as important here like 5 or 6 early since max in the final minute the tactic varys here and two point are two points.