First of all, it highly reflects the professionalism and depth of research in this field.
Second, the angle is reflected in innovation. A good literary criticism often puts forward a new research angle. For example, Zhong Ming wrote a paper about the poet Zhang Zao. He described Zhang Zao's poetic style as androgyny, which was an unexpected formulation. But after reading the whole article, there is no more suitable word to describe Zhang Zao's poems. I think this is the effect that innovation should achieve.
Third, the scale is reflected in objectivity. Literary criticism is mainly based on objective analysis, and too extreme views are not rational criticism.
I hope I can help you. If you are satisfied, please adopt the answer!