First, calligraphy is art, and art has artistic characteristics. Painting more and painting less is the need of artistic beauty;
China Chinese characters and China civilization have a long history. Many Chinese characters have many ways of writing, some of which are only known by a few professionals.
Art comes from reality, but it is not bound by reality.
Therefore, when you are writing, you don't have to pay attention to these.
I'd like to introduce a good book: Yu Youren Calligraphy Dictionary, which contains many ways to write each Chinese character.