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At the bottom of this post, Dan thanks Jamie (the author of the other post). Dan’s been posting about the topic on Twitter as well. So basically they talked about it and both wrote up their takes.

(The post, for anyone curious: https://news.ycombinator.com/item?id=28879240)

Yeah, it's very similar in a lot of ways.

My first thought was that people were linking related stuff. But the two posts were written within a day of each other. Perhaps one was inspired by the other or perhaps the authors know each other.

Dan Luu is a pretty prolific blogger / tweeter about engineering and this one is the later blogpost. I find it unlikely it was a "repurpose".

Both bloggers know each other (this is pretty obvious if you read some of their online stuff), so Dan Luu probably reviewed the other post early and thought it interesting enough to add his own take.

Yeah that makes sense. Sounded like the most likely explanation honestly.