Rationality is --or should be -- for regular people, and very few regular people need to worry about the curvature of the universe in an average day.
Requiring rationality to be restricted to an aversion to edge-cases limits its usefulness to the point of being almost entirely without value.
To relate this more directly: that flat-spacetime thing is very relevant to understanding how "something" can come from "nothing". Which touches on how we all got here -- a very important, existentially speaking, question. One that can have an impact on even the 'ordinary' person's 'average day'. After all; if it turns out there's no reason for anyone to believe in a God, then many of the things many people do or say on a daily basis become... extraneous at best.
Furthermore: one of the things that instrumental rationality as an approach needs to have in its "toolkit" is the ability to deeply examine thoughts, ideas, and events in advance and from those examinations create heuristics ("rules of thumb") that enable us to make better decisions. That requires the use of sometimes very 'technical' turns of phrase. It's simply unavoidable.
That gets all the more true when you're trying to convey a very precise thought about a very nuanced topic. The thing is, regardless of where one looks in life there are more levels of complexity than we normally pay attention to. But that doesn't make those levels of complexity irrelevant; it just means that we abstract that complexity away in our 'average' lives. Enter said heuristics.
Part of instrumental rationality as an approach, I believe, is the notion of at least occassionally breaking down into their constituent parts the various forms of complexity we usually ignore, in order to try to come up with better abstractions with which to ignore said complexity when it shouldn't be a focus of our attention. I've gotten in "trouble" here on lesswrong for making similar statements before, however -- (though to add nuance that was more about whether generalizations are appropriate in a given 'depth' of conversation.)
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The topics of rationality and existential risk reduction need their own Richard Dawkins. Their own Darwin. Their own Voltaire.
Rhetoric moves minds.
Students and masochists aside, people read only what is exciting. So: Want to make an impact? Be exciting. You must be heard before you can turn heads in the right direction.
Thus, I've decided to try harder and actually put effort into the quality of my writing instead of just cranking stuff out quickly so I can fill in inferential gaps and get to the cutting edge of the research subjects I care about.
That's why I asked LWers for their picks of best nonfiction writing on Less Wrong.
It's also why I've been reading lots of good science writing, focusing on those who manage to be exciting while covering fairly complex subjects: Dawkins, Sagan, Gleick, Zimmer, Shermer, Ramachandran, Roach, Sacks, Hawking, Greene, Hofstadter, Penrose, Wilson, Feynman, Kaku, Gould, Bryson, Pinker, Kurzban, and others.
I've also been re-reading lots of books and articles on how to write well: Keys to Great Writing, Style: Lessons in Clarity and Grace, Elements of Style, On Writing Well, The Classic Guide to Better Writing, The Book on Writing, Telling True Stories, Writing Tools, Ideas into Words, The Chicago Guide to Communicating Science, A Field Guide for Science Writers, Six Rules for Rewriting, Writing, Briefly, and Singularity Writing Advice. (Conversations with Eliezer also helped.)
I don't know if I can become the Voltaire of rationality and existential risk reduction, but it seems worth a shot. Every improvement in writing style is beneficial even if my starry goal is never met. Also, it appears I produce better writing without really trying than most people produce with trying. (If you've ever had to grade essays by honors English seniors, you'll know what I mean.) I expect to gain more by striving where I already excel than by pushing where I have little natural talent.
(I won't try to write everything well. Sometimes I should just crank things out. To be honest, I didn't spend much time optimizing this post.)
My other hope is that a few other writers decide they would like to be the Voltaire of rationality and/or existential risk reduction. May this post be useful to them. It's a list of recommendations on writing style pulled from many sources, in no particular order.
And, just one piece of process advice. Do not apply any of these rules while drafting. Instead, write down whatever horrible shit comes out of you and do it quickly. Then revise, revise, revise.
Now: What are your favorite pieces of writing advice?