I think it would be fine if the HN post also said Part 1. I don't have a huge problem with "to be continued", but in a post just called "A year without caffeine" you expect something about a year without caffeine.
You see, the problem isn't about getting the information quickly. It's not stock information. It's about getting it complete. If I'm reading, I'm allocating time for a precise matter; and when I don't get the result, my time was probably lost.