kb also touches upon the subject of blogging, which I'd like to share my thoughts about.

Because this is blogging: sharing thoughts. Communication is sharing thoughts; some of them just happened to be based on education that the other person doesn't have, academical or personal.

Nobody has The Truth, and some people even recognize it - but people still want to share what they know. Some - in hopes that it will help another human being who hasn't arrived to the conclusion they've met and who might benefit from it or the process of its birth in the blogger's mind (see Raptitude by David Cain for an example of such sharing). Nobody can give you The Ladder, but sharing a stair or two is nice, especially when those don't run out.

I won't comment on how Eliezer and his followers treat different topics, in comments or otherwise, because I don't have enough experience with them for such an analysis. I just want to point out that the old man kb isn't holding the cup of truth, either, generalizing about bloggers as if they're a homogenous bunch. Just like audioengineers and writers, one would have to presume. Meanwhile:

Redditors tend to overestimate my knowledge about things because I only comment on things I know and understand.

Apparently, this doesn't apply to rationalists or, the more I see it, anyone else whose Internet handle isn't "kleinbl00". Keep in mind: this is from his personal subreddit, where he shares links about himself.