Arthur Schopenhauer wrote extensively on this and I feel he said it best.
[Excessive reading] robs the mind of all elasticity; it is like keeping a spring under a continuous, heavy weight. If a man does not want to think, the safest way is to take up a book directly he has a spare moment.
- "Thinking for Oneself"
Contains a great quote by Pope Duncaid 3:
"Forever reading, never to be read."
Link:
https://ebooks.adelaide.edu.au/s/schopenhauer/arthur/essays/...