Also, if we just side-step the question and context for a moment and extrapolate to all posts ever and pretend like the word title doesn't mean something,

You're the one pretending the word title means something different that it does. The title is useful in some circumstances (e.g. searches, RAT, etc), but it's useless (or even detrimental) when reading the post. It's the post that should have the substance, and it's the title that's the derived value.