I ran on MySQL for a few months without issues, but my code was disgusting. My choice was clean code + slow, or ugly code + fast. Today I have clean code + fast, thanks partly to better library support in Clojure, so I'm happier. I'll be the first to admit that I didn't have much of a clue a year and a half ago. I think I have a bit more of one today, but I could be wrong.
Again, not sure why any of this is important enough to talk about on HN. I'm hoping this thread dies before my server bursts into flames.
As for why it's on the homepage, I don't think it belongs here either. The intended audience was rather more narrow than HN.