The entire blog post being in lowercase distracted me more than I thought it would.
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I think many of us abandoned it when we went professional. Or abandoned it in those contexts but still do it in others. I don't do it on HN, clearly - but I do it almost everywhere else. It's much more natural to me to skip capitals.
I believe there was also a period in the transition to ubiquitous smartphones where it wasn't an option to turn off auto-caps, or maybe there just wasn't the fine-grained control of which auto-correct you use on mobile devices that there is now. I suspect that killed some all-lowercase habits. I think that's why I ended up with a "normal" style on HN where I use caps and normal punctuation (I don't usually use periods for sentences that terminate a paragraph outside of HN.)