Ma Ji is a Hui nationality. Why cremate after death?

Teacher Ma Ji is not a Hui, but a Han. Master Ma is a Hui nationality, and there are many artworks in his home, such as Arabic calligraphy, which are common among Hui people. Hui people call it "Aunt Du", and I have seen the video of Ma Lao's funeral, which was held entirely by installing the funeral of Hui people.