Totally new information. Libraries and databases for general use cases can be bloated and bad when compared to rolling your own code that's specifically for your domain. This is genius level thinking. I had no idea. Nobody on the face of the earth ever knew about this concept until this article appeared on HN, so this is absolutely revolutionary and will likely change the industry forever.
He gave it a metaphorical name from hiking too. "Stupid Light" and I'm just blown away at the incredible Einstein level imagination here.