Final answer:
The importance of the assignment due date is highlighted as it represents responsibility and affects academic performance.
Step-by-step explanation:
The dialogue between Hermie and Ron regarding the importance of their assignment due date on magical objects suggests that Ron should care because deadlines ensure that the work is completed in a timely manner and can affect their grades. Meeting due dates is crucial in academic and professional settings, symbolizing responsibility and commitment to the given task. Moreover, the assignment might contain important content that could be critical for upcoming exams or further discussions in class.