Exactly, educations is not a vocational school where we teach people useful skills so they start doing whatever they learned. Machines have long been able to do

Exactly, educations is not a vocational school where we teach people useful skills so they start doing whatever they learned. Machines have long been able to do things that we teach in the schools, the purpose of teaching is developing people. Once they are developed(that means they built understanding of how nature and society works and how to interact with) and its time to expect an output, only then we can talk about teaching useful skills. Vocational schools do exist and they are useful but that's not what we are concerned about. People who cheat not to learn useful skills simply spend their time and money.