Rapid feedback and individualized pacing. Can accelerate learning for business, military, learning various college subjects. Doesn't improve skill or level. Does save time and effort. Humans can learn independently.
Many discoveries come about as a result of curiosity.
Learning is more lasting when people discover facts and principles on their own. Discovery learning tends to produce better understanding of new problems and situations. In sum, it seems worthwile to take extra steps to foster insight and deeper understanding, even if learning by discovery takes longer. Anything that can be learned from direct experience can be learned by observation. Learn a general rule that can be applied to various situations.