My understanding is that Discussion is simply an area that can house a larger set of materials than can the main area of Less Wrong. It is in no way limited to meta-level discussions, but meta-level discussions are welcome there.
There's been a general request to keep meta-level discussions in the main area to a minimum, though not to zero. This request seems sensible to me. It would be nice to keep the main site full of posts that can actually help readers improve their rationality, with high signal to noise. And the Discussion area allows us to have most of the benefits from meta-level discussions without diluting the main site.
But I like the energy in this post and in some of the comments, and I might regret my original complaint in this case.
It would be nice to get some more explicit guidelines about appropriate content for the front page. In a way, meetup posts are 'meta' posts, and less substantial than what I've written here. But then, I understand what you mean about now wanting to clog the Posts section with meta-level posts. But maybe it's okay if it's in the Posts section but not promoted to the front page? Hard to say. Clearer guidelines would be nice...
My deconversion from Christianity had a large positive impact on my life. I suspect it had a small positive impact on the world, too. (For example, I no longer condemn gays or waste time and money on a relationship with an imaginary friend.) And my deconversion did not happen because I came to understand the Bayesian concept of evidence or Kolmogorov complexity or Solomonoff induction. I deconverted because I encountered some very basic arguments for non-belief, for example those in Dan Barker's Losing Faith in Faith.
Less Wrong has at least two goals. One goal is to raise the sanity waterline. If most people understood just the basics Occam's razor, what constitutes evidence and why, general trends of science, reductionism, and cognitive biases, the world would be greatly improved. Yudkowsky's upcoming books are aimed at this first goal of raising the sanity waterline. So are most of the sequences. So are learning-friendly posts like References & Resources for LessWrong.
A second goal is to attract some of the best human brains on the planet and make progress on issues related to the Friendly AI problem, the problem with the greatest leverage in the universe. I have suggested that Less Wrong would make faster progress toward this goal if it worked more directly with the community of scholars already tackling the exact same problems. I don't personally work toward this goal because I'm not mathematically sophisticated enough to do so, but I'm glad others are!
Still, I think the first goal could be more explicitly pursued. There are many people like myself and jwhendy who can be massively impacted for the better not by coming to a realization about algorithmic learning theory, but by coming to understand the basics of rationality like probability and the proper role of belief and reductionism.
Reasons for Less Wrong to devote more energy to the basics
How to do it
Let me put some meat on this. What does more focus on the basics look like? Here are some ideas: