This is an ad.
I know the author has a long history here and I'm sure the post is a genuine reflection. But how is posting "I used my own product and it felt really good" anything other than self promotion?
Reminder, this post is also an ad:
It would be acceptable iff the author prefixed it with Show HN. My suggestion to mods if the post is worth keeping up is to do that.
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So all the blog posts, every 10s on HN, shilling for Anthropic are not ads but this is?