[QAPereo]

To #2, because even putting aside how many scientists would have no interest in doing that, they would also be generally unqualified. Being a good researcher doesn’t make you a good teacher, and you need to be a very good teacher to turn your results into something a high school student could understand, and yet which still communicates your results accurately.

[epistasis]

You're absolutely right here. Many journals do #2, and I generally find these to be worthless. For example, the Author Summaries on PLoS articles in a field that I'm not familiar with almost never help me. Often times when I read a paper in detail and journal club it with others, the conclusions that we derive from the data presented in figures has quite different emphasis than what is emphasized in the paper itself.

Sometimes with hindsight one can go back to a paper and say "this is important because of X" but it can be really hard to do that at the beginning, and often times the true value of the data may be different than the hypothesis under which the data was originally generated.