Isn't that motte/bailey

Not sure it's motte-and-bailey. I do think there are several serious pathologies in large swathes of contemporary philosophy. And I say this not as a dilettante, but a professional philosopher. There are areas of philosophy where these pathological tendencies are being successfully held at bay, and I do think there are promising signs that those areas are growing in influence. But much of mainstream philosophy, especially mainstream metaphysics and epistemology, does suffer from continued adherence to what I consider archaic and unhelpful methodology. And I think that's what Luke is trying to point out. He does go overboard with his rhetoric, and I think he lacks a feel for the genuine insights of the Western philosophical tradition (as smart and insightful as I think Yudkowsky is, I really find it odd that someone who purports to be reasonably familar with philosophy would cite him as their favorite philosopher). But I think there is a sound point lurking under there, and not merely a banal "motte"-style point.

I was only pointing out in response to the OP that I have been harping on LW's silly anti-academic sentiment for ages, that's all.

I absolutely agree with you on the silliness of the anti-academic sentiment.

In defense of Luke, when I've spent the time to read through philosophy books by strong-naturalist academic philosophers, they've often devoted page-counts easily equivalent in length to "Philosophy: a diseased discipline" to carefully, charitably, academically, verbosely tearing non-naturalist philosophy a new asshole. Luke's post has tended to be a breath of fresh air that I reread after reading any philosophy paper that doesn't come from a strongly naturalist perspective.

It sincerely worries me that the academics in philosophy who do really excellent work, work that does apply to the real world-that-is-made-of-atoms, work that does map-the-territory, have to spend large amounts of effort just beating down obviously bad beliefs over and over again. You should be able to shoot down a bad idea once, preferably in the peer-review phase, and not have to fight it again and again like a bad zombie.

(Examples of obviously bad ideas: p-zombies, Platonism, Bayesian epistemology (the latter two may require explanation).)

Now, to signal fairness even where I'm blatantly opinionated, plenty of people on LW are indeed irritatingly "men of one idea", that usually being some variation on AIXI. And in fact, plenty of people on LW hold philosophical opinions I consider obviously bad, like mathematical Platonism.

But the answer to those bad things hasn't usually been "more philosophy", as if any philosophy is good philosophy, but instead more naturalism, investing more effort to accommodate conceptual theorizing to the world-that-is-made-of-atoms.

Since significant portions of academic philosophy (for instance, Thomas Nagel) are instead devoted to the view - one that I once expected to be contrarian but which I now find depressingly common - that science and naturalism are wrong, or that they are unjustified, or that they are necessarily incapable of answering some-or-another important question - having one page on a contrarian intellectual-hipsters' website devoted to ragging on these ought-to-be-contrarian views is a bit of a relief.

That seems to be entirely analytic philosophy. My problem is that analytical philosophy is culturally irrelevant. Anthropologists, sociologists, art theorists, and artists talk about continental philosophy, Saussurian (!) linguistics, and psychoanalytic theory. The only things they use from analytic philosophy are arguments like Godel's incompleteness theorem, Wittgenstein's later stuff, or Quine's ontological relativism, that they interpret as saying that analytic philosophy doesn't work.