Why can't an artist who is also 0.7 write a pen?

I don't know the structural properties of the nib. The same 0.7 artist's pen-tip hero pen can't write a stroke because he doesn't know enough about the structure and nature of the pen-tip except the technique, and any tool has its own unique characteristics, so we should foster strengths and avoid weaknesses. The so-called front edge refers to the sharp part displayed at the beginning and end of the stroke, such as the writing standard of the brush, and the hard pen can only converge as much as possible.