You have some evidence for this?

Only some personal experience and general intuition. I don't think anyone, even Eliezer, is going to argue that zero meta discussion is optimal. The question then is how much is optimal. It is possible that a weaker version of my statement like starting it with "it seems that" might have been helpful.

In this thread and the perfectly superfluous other thread you made for this topic, I have observed a tendency to state ex cathedra beliefs on the nature of communities and what mechanisms are necessary for their survival.

I agree that there's a fair bit of stated beliefs without much evidence all around, although I'm puzzled by your description of the other thread as superfluous.