If it were reliably contained to one thread I don't think there would even need to be a rule, yeah. I often see it where a bunch of top-level comments are spell

If it were reliably contained to one thread I don't think there would even need to be a rule, yeah. I often see it where a bunch of top-level comments are spelling out the same 2 or 3 issues (some in a mean-spirited way), and though I care deeply about software accessibility, that is itself a usability issue for HN.