I was thinking that, for example, if there is a neat discussion going on about really detailed stuff in the paper (like one sharp peak in one of the figures or one value in a table), it can be really good resource for the reader of the paper as well. They can look around in the comments. Seperately, if they couldn't find it, they can just ask.
You might want to edit your post / title. I don't think I would have known that it was for academic papers if I hadn't have opened the link.