Chinese painting chess pieces have inscriptions, and the left and right corners have borders, so you can't stamp them casually. Square leisure stamp can be affixed to the upper right corner, square leisure stamp can be affixed to the lower left corner and square leisure stamp can be affixed to the lower right corner. If there is no need to stamp a leisure stamp here, it will be self-defeating if you barely stamp it.
Printers who have always successfully expanded their materials attach great importance to calligraphy, and "no mistakes" is an important prerequisite to ensure that printed words have appreciation value. Calligraphy is the art of writing. If you can't even read, there is no artistic appreciation.
At first glance, seal script is a bit strange, but it is actually very easy to learn and difficult to master. The development of seal script is centered on "shape". Although it later became an "image", there are always tangible traces to explore its origin, so seal script is artistic from the beginning.
References:
Baidu encyclopedia-seal