Follow-up to: https://www.lesswrong.com/posts/PSichw8wqmbood6fj/this-territory-does-not-exist
Here's a simple and direct argument for my version of verificationism.
Note that the argument uses ontological terms that are meaningless on my views. It functions as a reductio - either one must accept the conclusion, or accept that some of the premises are meaningless, which amounts to the same thing.
Premise 1: The level IV multiverse is possible.
Premise 2: If the level IV multiverse is possible, then we cannot know that we are not in it.
Lemma 1: We cannot know that we are not in the level IV multiverse.
Premise 3: If we are in the level IV multiverse, then ontological claims about our world are meaningless, because we simultaneously exist in worlds where they are true and worlds where they are not true.
Lemma 2: If we can know that ontological claims are meaningful, then we can know we're not in the level IV multiverse.
Conclusion: We cannot know that ontological claims about our world are meaningful.
Edited to add two lemmas. Premises and conclusion unchanged.
I agree- lots of people (including me, of course) are learning because they want to- not as part of some instrumental plan to achieve their other goals. I think this is significant evidence that we do terminally value learning. However, the way that I personally have the most fun learning is not the way that is best for cultivating a perfect understanding of reality (nor developing the model which is most instrumentally efficient, for that matter). This indicates that I don't necessarily want to learn so that I can have the mental model that most accurately describes reality- I have fun learning for complicated reasons which I don't expect align with any short guiding principle.
Also, at least for now, I get basically all of my expected value from learning from my expectations for being able to leverage that knowledge. I have a lot more fun learning about e.g. history than the things I actually spend my time on, but historical knowledge isn't nearly as useful, so I'm not spending my time on it.
In retrospect, I should've said something more along the lines of "We value understanding in and of itself, but (at least for me, and at least for now) most of the value in our understanding is from its practical role in the advancement of our other goals."
There's been a mix-up here- my meaning for "specific" also includes "whichever model corresponds to reality the best"