Palette swapping may be a shortcut, but it does allow designers to create enemies that keep pace with the player's progress while still hinting that the enemies will follow a familiar pattern. This is especially important when a given area is intended to be fast-paced or lead up to a climax, and the designers don't want the player stopping constantly to study "new" enemies. Also, can be used for worldbuilding: using palette-swapped monsters can hint at connections between otherwise fmwhatsapp disparate locations. In the case of bosses it can be used to hint at relationships between creatures that might not otherwise be apparent to the player.