The function of the seal:
Can represent the identity of the author alone.
This is a formal recognition of the work.
Stamping is a complete finished product.
The calligrapher's seal itself also has certain artistic value.
Non-printed calligraphy can only explain a few points:
1. indicates that it is not a finished product.
The author doesn't officially think that he has finished a work.
I don't want to be a formal inscription.
The seal is unique and can represent the author's approval alone. If it is not stamped, the author may feel that the work is not ideal.