Can you see how it all works?
We teach the entire workings of tai chi to everyone but only the most dedicated people penetrate the syllabus.
It is like telling someone a secret.
The secret only has meaning and value if that person understands the context and application.
If you tell it to the wrong person, they simply will not care. It means nothing to them.
Hence, students who work hard 'get it' and learn the teachings.