If they can perform well without reviewing the material, that's a problem with either the performance measure or the material. And not watching lectures is not

If they can perform well without reviewing the material, that's a problem with either the performance measure or the material. And not watching lectures is not the same as not reviewing the material. I generally prefer textbooks and working through proofs or practice problems by hand. If I listen to someone describe something technical I zone out too quickly. The only exception seems to be if I'm able to work ahead enough that the lecture feels like review. Then I'm able to engage.