>Socrates is said to have criticized writing for letting people to not train their memory

And he likely had a point. What I recently noticed is that my father, who had very little formal education but happened to have very old-school teachers who hammered him with memorizing a lot of poetry, which he continued in adult life, is more verbally fluent somehow than a lot of young kids who don't have command of grammar any more. ("would of")

Granted they likely don't write or read much either but directionally if you keep outsourcing mental work, you degrade. When I studied Japanese I liked the term a teacher had for his defense of memorizing Kanji by handwriting, which he called "neuro-muscular". Like playing scales on the guitar or piano there is something that keeps you snappy in memorization and rote practice that goes away if you only passively search.

"Neuro-muscular" great insight.