Even taking the writers premise as true, it’s not scalable. Most teachers do not have the necessary capabilities, even with training, to run whole classroom engaged learning experiences. School is designed to meet the capabilities of teachers as much as it does the needs of students.
That said, most students don’t have the capacity to benefit from personalized learning either. The whole problem with the discussion of improving education is the assumption that a proper education process can increase the size of the “glass” by pouring in more “water.” Not everyone is capable of every type of thought, and that’s ok! Every type of person is valuable.
People who are unusually intelligent should be given free time to self teach, and if possible tutored. Traditional classrooms work well enough for everyone else, except for the drug issues.