Yes, both the reduction in the amount of reading and the reduction in the complexity of the average read text is leading towards a decline in cognition. Less than half of American adults have read a book in the last year, and younger people are reading less books[0].
The empirical evidence for cognitive benefits of reading books is so numerous and obvious that citing sources feels silly. Reading increases vocabulary, which are the building blocks that ideas are formed. This alone would be worth the time cost but reading also increases concentration, improves memory, and reduces cognitive decline.
Reading books is roughly the same level of benefit as exercise.
The empirical evidence for cognitive benefits of reading books is so numerous and obvious that citing sources feels silly. Reading increases vocabulary, which are the building blocks that ideas are formed. This alone would be worth the time cost but reading also increases concentration, improves memory, and reduces cognitive decline.
Reading books is roughly the same level of benefit as exercise.
[0] https://www.arts.gov/stories/blog/2024/federal-data-reading-...