The question about cutting boards was mine.
Sometimes you run into gray areas, whether in the kitchen or programming on the computer. There's not necessarily a clear and concise answer for some things, but having the community answer, vote, and weigh-in is a great way to see what is popular and what isn't.
I agree with Jeff Atwood that perhaps the question could have had a tighter focus. I tend to ask questions with a bullet list where I try to outline the points I am looking for, which may cause the question to appear more general and more difficult to answer.
Though, personally I would rather visit one thread for my cutting board Q&A rather than search through a half dozen threads to get the same information.
The pros/cons idea is a standard part of a correct answer to a question, because there are many situations in which you have two items, and neither are necessarily better than the other: it boils down to your budget, preference, and ability.
Having some professionals lay out the pros/cons of any kitchen purchase is worthwhile because beginners can see that perhaps they should start with one item or technique, and advance it later as finances and/or ability improve.
If the cutting board question were a matter entirely of opinion, the question would be better as a community wiki or closed entirely. But there are concrete scientific facts about all of the bullet points, and I think that makes the question valid and very on-topic.