Because the average American is considered to have a readability level equivalent to a 7th/8th grader (12 to 14 years old). They lack the critical thinking skills to from from search results to prioritized list. :-/
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For decades, the standard was 6th grade. I believe that was part of the APA guidelines.
But at least Americans have been getting stupider, on average. IMO, now I think you need to write at the 4th or 5th grade level.