Good link. I like that Grognor mentions that obviousness is just a matter of perception and people's ideas about what's obvious will vary, so we shouldn't assume other people know "obvious" things. However, I think that it's really important for us to be aware that if you think something is obvious, you stop questioning, and you're then left with what is essentially a first impression - but I don't see Grognor mention that semantic stop sign like effect in the post, nor do I see anything about people using obviousness as a way to falsely support points.

Do you think Grognor would be interested in updating the article to include additional negative effects of obviousness? Then again putting too many points into an article makes articles confusing and less fun to read. Maybe I should write one. Do you know if anyone has written an article yet on obviousness as a meta semantic stop sign, or obviousness as a false supportive argument? If not, I'll do it.