Books also make us less capable at rote memorization. People used to do much more memorization. Search engines taught us to remember the keywords, not the facts. Calculators made us rarely do mental calculations. This is what happens - progress is also regress, you automate on one side and the skill gets atrophied on the other side, or replaced with meta-skills.

How many of us know how to use machine code? And we call ourselves software engineers.