Student's very willingness — to even try — is harmed.

It is NOT just A LACK OF PROGRESS.
Discouragement is caused by this system. Beliefs such as "I am not good at math" are caused by this system.
It's the system. To change the system, change the method.
READY FOR A SOLUTION? SEE THE I-o METHOD:

SIMPLE, DIFFERENT AND NEW
AND MAKES IMMEDIATE LOGICAL SENSE;