That seems like the wrong take away to me. Why do we change our minds so little?
1.)Some of our positions are just right.
2.)We are wrong, but we don't take the time and effort to understand why we should change our minds.
We don't know which situation we are in beforehand, but if you change your mind less than you think you do, doesn't that mean you think you are often wrong? And that you are wrong about how you respond to it?
You could try to figure out what possible things would get you to change your mind, and look directly at those things, trying to fully understand whether they are or are not the way that would change things.
I'm currently doing research into political candidates to decide how I'm going to vote. It's tedious because I don't know of a good system that prescribes how much research to do and what exactly to factor into my voting decision. I'm wondering whether the information in Yudkowsky's "We Change Our Minds Less Often Than We Think" would justify a lazy approach: once I start leaning one way or the other, assume that more information won't change that (because We Change Our Minds Less Often Than We Think) and move on.