When you need a score, e.g. at the end of a game.
5 pops out, 2 cuts to the ball, 3 downscreens for 4, who curls for a lob (or direct) pass.
5 and 2 clear out for the little-to-big downscreen, there is no help behind 4.
See Inbounds - Baseline Golden State (Lob).