From a poster's perspective: it is very hard to tell which ideas your audience considers beginner-level and which they consider advanced-level. Especially when the audience is as diverse and self-selected as at LW. I've posted a few times asking "Hey, does everyone here already know X or not?" and I've rarely gotten the answer I expected.

Responses to my post last night ranged from "this is obvious" to "this is wrong" to "this acronym could be useful" to "this was one of my favorite posts yet". I don't quite know what to do with that. Right now I am erring on the side of caution; I'd rather write something obvious to everyone than skip an inferential distance somewhere.

Upvoting ought to be the main feedback mechanism here, but right now I worry that a well-written true (but obvious) article will get voted up just because it's well-written and true, and everyone figures it will probably help someone else. Maybe make a rule that you should not upvote a post unless it teaches you something? Or maybe end a post whose difficulty level you're not sure of with "Please rate this as too obvious, okay, or too hard"?

EDIT: It's also hard to remember if something has already been covered on Overcoming Bias (see: source confusion). There's not any nice list of Robin or the other writers' posts like there is of Eliezer's, is there?