The number of big projects with over a dozen identical comments saying "Same problem" is quite astounding. At what point does the maintainer turn off notifications? 5? 20?

Perhaps the point was that unless you have something useful to add to a GitHub issue then don't comment.

People don't want Reddit style pun threads here and yet to hear complaints about that being enforced, in fact the opposite. GitHub issues is similar in that sense. Everything has its place and time.