The editor for posts is not the same as the editor for comments; it's a WYSIWYG editor and the key is those little buttons at the top.
Was that a design decision? Who made it? And where do they live?
There is some merit to it, because HTML is more expressive. On the other hand, usability of editor and drafts is terrible, and lack of standardization in content markup is bad for the content's health. I write posts in Latex and convert them to HTML with a regexp script...
One of the missions of OB/LW is to attract new learners, and it's clear that they are succeeding. But the format feels like a very difficult one for those new to these ideas, with beginner-level ideas interspersed with advanced or unsettled theory and meta-level discussions. You wouldn't play <insert cool-sounding, anime-ish video game here> with the levels on shuffle mode, but reading Less Wrong must feel like doing so for initiates.
How do we make the site better for learners? Provide a "syllabus" that shows a series of OB and LW posts which should be read in order? Have a separate beginner site or feed or header? Put labels on posts that designate them with a level?