He is saying that people with different background a.) won't be able to guess right what is the thing to learn that will give them advantage later on and would benefit feedback b.) have less free time to play around and thus will perform better if you don't expect tell them to figure via trial and error what is needed.

Through, my experience with this organizational style was bad, mostly because people ended in quite ugly competitive behavior. Mostly due to rules being unclear, resentment being build up, people choosing highly visible tasks instead of needed tasks and so on and so forth.a lot of insecurity everywhere.

There were also a lot of of random attempts by random colleguess to take control and micromanage random people+responsibilities in attempt to look like natural leaders. Did I mentioned insecurity? Someone tring to look like autonomous leader while being completely insecure about limits of his responsibilities and powers is highly unpleasant to work with. You deal with politics like 80% of time as result.