These questions should eventually be deleted. I suspect that we are keeping them around in order to bootstrap the site, out of worry: if we close questions that are so popular, seemingly most important to Christians, don't we risk having people abandon this site for something more useful? I don't think so. As David points out, these questions invite personal opinion. Personal opinion is toxic.
For the time will come when people will not tolerate sound doctrine but, following their own desires and insatiable curiosity, will accumulate teachers and will stop listening to the truth and will be diverted to myths.
The absence of personal opinion is what will make this site stand out among other sites. Allowing personal opinion will turn people away. After all, it's only a matter of time until you find a personal opinion that doesn't match your own.
The example that prompted me to reply is in David's question, which quotes the top answer to the older "is X a sin" meta discussion. The full text of that quotation references a question titled "Is masturbation a sin?" as an archetype of an appropriate "sin" question. The top answer in that question, quoted here (in full!) because I hope the whole mess will be deleted:
The root of the matter is lust.
Matthew 5:28 But I say to you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart.
I would say that the act itself is not the sin, it's the intent of the act.
This is the type of answer we want to avoid. The author is offering a personal interpretation of the Bible, and, in my view, is utterly butchering the concept of sin. Sin is an act, and the aim of the act matters: Jesus is teaching that a neutral act like "looking" can become sinful. But the intent (or purpose) does not matter for non-neutral sinful acts, due to Rom3:8. So the answer is not only deeply confused, but has almost certainly led people into sin. Of course the point isn't that I disagree with the answer, the point is that seeing this answer rated so highly makes me, for my own good reasons, seriously worry about whether I should contribute to this site and be a part of this community.
If the question had been "I'm a Catholic, is masturbation a sin?", one would reply "always", quote the CCC, and point out that it can't be done even to provide a semen sample for medical reasons.
David has already mentioned some good reasons to dislike these open-ended questions. My point is that they aren't just sometimes inconvenient, but in even the best cases are actively harmful to the formation of the community and the reputation of this site. The motto of this site should be "no personal opinions". Be friendly, but close and delete the question.