Every job/calling/whatever sucks. Even the ones you can't resist. However much fun/joy/fulfillment there is, there's also work in the mix. I think if you do anything long enough, you forget how everything else sucks just as much (and in some cases, more).
On a less cynical note, he may just have been trying to jar the guy into thinking things through. He's probably seen a lot of regret. Quickly scanning the link, looks like after the stardust cleared the new author did just that. Thinking about things can be helpful even if the thinking doesn't change your mind.