I think the main point being conveyed is that writing by hand improves recollection. Whether it comes naturally or not, or whether it is a better system or not, of course is subjective. However there is truth in the notion.

When I draw something I can remember the shapes better than if I simply sit there and stare at it. Something with the hand-eye coordination triggers the brain into remembering.

Typing in contrast, one is not tracing the shapes of the letters (the thing to remember), but pushing buttons that are not physically related.

It’s the same thing as if you can touch and hold an object it becomes much more real than if you can see it in a picture or on a screen. Remembering is connected better to touch.