Most of the time that's how I feel about it, too. I'd never flag an article about some framework or technology I had never heard of. But in this case I'm not seeing the connection to technology or startups or general interest; it just seems off topic. I'm sure it's a great article, I'm just not sure it belongs on HN, so I flagged it.
Not everything on the front page excites everyone's curiosity, but it doesn't need to. Avoiding monoculture is the main thing. This is good for technical work too.
