I don't think that truth evaluation should always be the point (at least not initially). More like...a comparison to push into the list for deferred evaluation,

I don't think that truth evaluation should always be the point (at least not initially). More like...a comparison to push into the list for deferred evaluation, as the discussion evolves later in the thread. If the comment were a stand-alone work, I'd agree, there's no point without framing it as a complete argument with a thesis and supporting statements. However, it's a component of an evolving body of work (the entire comment tree for the story). It can provide an interesting thesis, and it'll either be supported or refuted by other comments.