From a Chicago Tribune article about the benefits of handwriting:
“For children, handwriting is extremely important. Not how well they do it, but that they do it and practice it,” said Karin Harman James, an assistant professor in the department of psychological and brain sciences at Indiana University. “Typing does not do the same thing.”James’s research suggests that writing by hand helps preliterate children to recognize letters. Other research mentioned in this article suggests that writing by hand aids memory and leads to greater fluidity in composition. These claims seem intuitive and obvious to me, but it’s nice that there’s data to lend support.
A related post
Cursive writing in Indiana (Planned obsolescence)
[I’m reminded of the Field Notes slogan: “I’m not writing it down to remember it later, I’m writing it down to remember it now.”]