@Richman nailed it.
The reality is not everyone lives through those 1,500 hours, and those who do will have scared the ever living • out of themselves enough times to either fix bad habits or quit.
Experience is a requisite in every career field. Medical students have to get hands on experience in surgery, law students do internships. Would you allow a surgeon operate on you if they had CLEP'd medical school instead of getting the experience? If not, why would you let a pilot fly you to Florida who did the same?