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Assignments are not evidence of learning. Assignments are pressure for students to learn. They are motivation to spend time acquiring knowledge and practicing skills expected to be acquired from the class.

For students who master this knowledge and skill without that pressure, assignments are distractions from further study. They force the student to expend time and energy on previously-mastered material, rather than allowing them to focus on unmastered subjects or additional classes.

If I were building a grading rubric, I would say that the test score at the end of each unit is the minimum score recorded for any assignment in that unit. My tests would be killers: I would target 80% raw scores, but final test scores would be on a curve, with the median score being recorded as an "A".

Score a 100% raw score on a unit test, and every assignment for that unit is raised to 100%. The student has demonstrated complete mastery of the subject matter; any grade less than 100% does not reflect their true capability.

Score an 80% raw score on the unit test, and every assignment for that unit is at least an 80%. A 95% assignment stays a 95%, but a 45% assignment is counted as 80%. Missing assignments are counted as 80%, not 0%.

I would go further: the raw score on the final exam replaces every lower grade in the grade book. You ace that indomitable horror of a final exam, you ace the class, regardless of how much effort you put in.