I recently answered the question, Why are hens so different from other birds? When I came back to the question just a few minutes ago, I noticed it had been closed as 'primarily opinion-based'. Now, I know this isn't a particularly high quality question. It doesn't show any research effort and it's perhaps too basic for this site1. If the question had been closed as too broad, or unclear, I would understand, but I don't see what about it is opinion-based? I'd like to know for my own edification.
1: And perhaps I shouldn't have answered it; I'm not a biologist, and I have no special training in biology, I'm just someone that likes to read about biology. But I like this site, and I feel this kind of basic question may be one of the few places where I can contribute to it.