What's so good about "Light Girls", which once made history and has a thin plot?

I have finished watching Girl with a Light Voice, and the overall feeling is that it is an excellent animation. But in fact, there is no such masterpiece that brings plot enjoyment. But in other ways, it is really superior. People are cute, plump and meticulous. Kyoto animation's control of the most common daily plots is really impeccable. Most importantly, this is an animation that everyone can watch and has a wide audience. This is also the reason why many unpopular good cartoons are not popular.

Therefore, in the plot's view, this movie may be just an above-average animation, which has achieved great success.