I want to see developers' opinions on the use of a certain language feature, where is the right place to ask that question?
On Stack Exchange!
Not on Stack Exchange!
Let me explain. No, let the FAQ explain.
Good: You should only ask practical, answerable questions based on actual problems that you face. "I'm designing a plugin system with X, Y, and Z features. Based on these requirements, would I be better off basing my system around interfaces or abstract classes, and why?"
Bad: every answer is equally valid. "Are interfaces better than abstract classes?"
Ugly: it is a rant disguised as a question. "Interfaces suck, amirite?"
Not on the main sites
These sites are not for gathering opinions--they are for clear, definitive answers. asking on the appropriate chat is fine.
On the other hand, if you modified your question to a "what are the pros and cons of feature X" (which would be on topic), and formed your own opinion based on the answers, I think you'd have better results.