The problem isn't "not having a single definitive answer" or it even being a "soft question." The question itself is probably pretty intriguing where a group of colleagues sitting around a table would likely enjoy this type of discussion. But these questions tend to be little more than conversation starters that will likely solicit debate, arguments, polling, and some pretty extended discussions. That type of activity is not really a good fit for this type of Q&A.
Stack Exchange is designed to create an authoritative collection of answers to actual questions about Chemistry. Answers are generally expected to be supported by facts, references, or specific expertise. As folks answer these questions, the information is vetted and improved and the best answers rise to the top.
That's the entire purpose of having a Stack Exchange site.
Stack Exchange is probably more like Wikipedia in that aspect than a random discussion forum. I know it's difficult to resist getting into debates and water-cooler conversations when you congregate around folks with interests the same as yours. Good, canonical Q&A is hard. But that's why we have chat rooms — to blow off some steam and get it all out of your system when the hard work of Q&A is done. The question cited above and those like it are better suited for one of the many discussion forums on the Internet… or our chat rooms right here.