Did the ancients learn calligraphy in Tian Zi lattice and write it in the lattice? What are the advantages and disadvantages?

For beginners of calligraphy, it is necessary to find out the structure of characters and the position of brushwork in order to copy and make the characters similar. In order to find the location easily, the ancients invented Jiugongge, Mi Zige, Tian Zige, Gege and now Huigongge. I wonder if you know the method and principle of graphic scaling? The same is true.