I didn't downvote, but if I had to guess, I suspect it's because your comment seems to have very little to do with the article (apart from the fact that the art

I didn't downvote, but if I had to guess, I suspect it's because your comment seems to have very little to do with the article (apart from the fact that the article is about medical research and you are advocating for a different sort of medical research). If there's a specific reason to think that mRNA could be used in treating chronic pain, including that could make your comment more obviously on-topic. (Not that your underlying point is a bad one! It's just hard to see how it fits in a discussion of this particular article.)