A shallow comment can contain a profound question. "What is the meaning of life?" would be an even shallower comment.

Were a comment to contain new and interesting information about a profound, i.e. generic, question, that would be fine. But this is precisely what internet comments bringing up generic questions don't usually do. It's not a good fit for the genre. Someone who really has something original to say about a profound question would be better off writing an essay, or a book. Certainly not a one-liner to an internet forum.

This is so much the case, in fact, that changing the subject from a concrete topic to a more generic one is a frequent form of trolling.

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