For example, I might write a post about "Value of Information is asymmetric because the different possible worlds are asymmetric," and I would not expect the body of that post to interest someone who thinks that assertion is obvious.

I think that there might be people who think that the assertion is probably true. If I'm however interested in math I care not only about whether the assertion is true but also about whether your proof of the assertion is correct.

P!=NP is in some sense an obvious assertion but it's still very interesting to search for the proof. Proofs are interesting.