As in 99.9% of cases of people who rush to the comments desperate to post a link to xkcd because, erm, actually I dunno. Why the hell do half the threads on HN have someone desperately posting an unrelated xkcd?
Because they aren’t unrelated.
no idea as there is always a relevant xkcd to be had instead.
It's our Nostradamus Prophecies, just like having an old Star Trek episode for everything that is happening today.