If you want constructive criticism, here is some: don't do that. Particularly not if you are basically complaining about other people doing that. And even more particularly not if it isn't just a quick comment on HN, but a separate post on your own blog; blog posts are expected to have more thought and care behind them than comments.
However, now that it is out there in the wild, I am taking notes for what to do (and what NOT to do) the next time I post something. The 'published in a hurry' bit happened because I accidentally clicked the publish button instead of the save draft button. I am not entirely sure how to unpublish on Medium - or if such a thing was even possible. So I went ahead and posted it to HN expecting - very literally - nothing.
One way or the other, I'm getting to learn quite a few things now! :)
[Edit: I see from comments elsewhere in this thread that you were not the author of the original presentation; but I still think the above is a good general rule to follow.]