It is important to understand other peoples personalities because you want to surround yourself with people who have a similar personality than you. If you are a blue, you don't surround yourself with orange, gold, or green. Most of the time you surround yourself with people of the same personality than you. If you are hiring someone for a job, you want someone who is gold, not orange. Orange people don't choose to stay on task, but gold people are always on task.