This doesn't seem to me to be about fudamental intelligence, but upbringing/training/priorities.
You say in another response that IQ correlates heavily with conscientiousness (though others dispute it). But even if that's true, different cultures/jobs/education systems make different sort of demands, and I don't think we can assume that most people who aren't currently inclined to read long, abstract posts can't do so.
I know from personal experience that it can take quite a long while to get used to a new sort of taking in information (lectures rather than lessons, reading rather than lectures, reading different sorts of things (science to arguments relying on formal or near-formal logic to broader humanities). And even people who are very competent at focusing on a particular way of gaining information can get out of the habit and find it hard to readjust after a break.
In terms of checking privilege, there is a real risk that those with slightly better training/jargon, or simply those who think/talk more like ourselves are mistaken for being fundamentally more intelligent/rational.
This doesn't seem to me to be about fundamental intelligence, but upbringing/training/priorities.
Well, then I have to ask what you think "fundamental intelligence" consists of, if not ability with (and consequently patience for and interest in) abstractions.
Can we taboo 'intelligence', perhaps? We are discussing what someone ought to do who is average in something, which I think we are implicitly assuming to be bell-curved-ish distributed. How changeable is that something, and how important is its presence to understanding the Sequences?
What should a not-very-smart person do? Suppose you know a not-very-smart person (around or below average intelligence). S/he read about rationality, has utilitarian inclinations, and wants to make the world better. However, s/he isn't smart enough to discover new knowledge in most fields, or contribute very much to a conversation of more knowledgeable experts on a given topic. Let's assume s/he has no exceptional talents in any area.
How do you think a person like that could best use his/her time and energy? What would you tell the person to do? This person may be, compared to average LW readership, less capable of noticing the irrationality in his/her actions even if s/he wants to be rid of it, and less easily able to notice the flaws in a bad argument. S/he may never be able to deeply understand why certain arguments are correct, certain scientific facts have to be the way they are, and telling him/her to be unsure or sure about anything seems dangerous if s/he doesn't really understand why.
My practical advice might be:
1) If you want to give to charity, follow GiveWell recommendations.
2) Learn about the basic biases, and commit to resisting them in your own life.
3) Follow advice that has been tested, that correctly predicts a positive outcome. If a hypothesis is untestable (there's an unsensible dragon in your garage) or doesn't predict anything (fire comes from phlogiston in combustable substances), or is tested and demonstrably false (god will smite you if you say it doesn't exist), don't waste time and energy on it. If you want to improve, look for tested methods that have significant positive results relevant to the area of interest. Similarly, if a person regularly gives you advice that does not lead to good outcomes, stop following it, and if someone gives advice that leads to good outcomes, start paying attention even if you like that person less.
At a more general level, my thoughts are tentative, but might include basic LW tenets such as:
1) Don't be afraid of the truth, because you're already enduring it.
2) If all the experts in a field agree on something, they might be wrong, but you are extremely unlikely to be better at uncovering the truth, so follow their advice, which might appear to conflict with...
3) Don't trust deep wisdom. Use Occam's razor, think about simple, basic reasons something might be true (this seems good for religion and moral issues, bad for scientific ideas and understanding)
4) If you find yourself flinching away from an idea, notice that, and give it extra attention.
Note: I mean this as a serious, and hopefully non-insulting question. Most people are intellectually near-average or below-average, and I have not seen extensive discussion on how to help them lead happier lives that make the world a better place.