Well my concern was raised when I saw this meta thread about a game design question being closed. Even though I agree the question is off topic and was asking for opinions.
I find that most game design questions are opinion based in the first (which is also a big factor of why we have average and great games) My only concern is that game design questions being primarily opinion based are not fit for this site, which make it less useful. But I still think we can address them in a way that they become on-topic questions, How do you think we can address them other than closing?