This blog post and all the comments in response feel very tautological. I think Marc has a fairly simple point here, which is don't spend time dwelling on the past. Learn from the past, take away information about how things can be improved, but then make a plan (for whatever it is that you are building/doing) and move forward with that plan.
In the podcast, he basically lays out that the A16Z thesis is that there is not enough technology, information, and intelligence in the world, so they are going out and investing in companies/ideas that can make an impact in these areas. That requires learning from the past, but not dwelling on it. Seems like a very sensible and positive approach to me.
You are right, a simpler way to frame it is: Marc is not anti introspection but post introspection in that there's something beyond introspection. The author seems to have made an uncharitable take for easy virality.
Why does he need to make a historical justification for it then? It would be disingenuous if, as the blog author suggests, Andreessen knows better.
That’s simply not what introspection is, though.