How could less correlated reading, no matter how high the quality, possibly compare to a solid book - in use of time or depth of impact?

The second chapter of every book has the advantage of being written, taking for granted that the previous chapter was read. The density and complexity writers and readers can handle in each chapter, keeps increasing throughout a book.

Short reads can convey important things, but nowhere near as many per page.

If you took any wonderful dense book about anything important, and turned it into short reads, with lower correlations of who finds them, reads them, and when, the page count would have to increase 10x - 100x. The setups and redundancy would be immense.

Books also get to explore many perspectives on the same important ideas. Which is not redundancy. It is the difference between recognizing a good idea and understanding it.

Feeling an epiphany vs. absorbing its implications. Awareness vs. fluency.