@ThanasisStylianou Submitting a proposal is already predicated on having a community (on SO/SE or elsewhere) organized and ready to support the idea, so that's already policy explicitly required by our process. The Community Team has wrangled with hundreds of these ideas over many many years, but we ultimately resolved to stop pursuing these out-of-band SE sites until we have the backing from Engineering to support alternate content types.

@Thanasis Have a look around the site tour. Look at the interface for asking a question. The buttons say, "ask a question/add another answer". There's nothing about posting reviews anywhere. The instructions say "We prefer questions that can be answered, not just discussed." Voting would have to be redefined. The help center is entirely wrong, and every close reason from too broad to primarily opinion-based would apply. Yes, we can explain away all the UI inconsistencies to force-fit the tool to fit the content, but without further dev support, that rabbit hole runs very deep

@GerhardPaseman It sounds like a worthwhile project. I would actually like to see more support for this on Stack Exchange. But in our current UI, once you start having to chase folks around constantly re-explaining what you really mean by a "question" and what should be posted as answers and how comments and voting should work, etc, it becomes a poor end-user experience to just about everyone not privy to the extensive support discussions explaining why the UI doesn't fit the content. We've been down this road many times. I hope we can support this someday, but not at this time.

@GerhardPaseman Discussion: not only harder to manage, but explicitly discouraged by the design -- i.e. a system of non-threaded responses which shuffle around based on the user vote, and a comment structure where followup is hidden or disappear in a way not particularly well suited to contribute directly to the main canon.

Ah, yes. Certainly no offense or attempt at censorship meant, @YemonChoi. See meta.stackexchange.com/questions/77373/…. I only removed the comments because I took your suggestions and integrated the information back into the post. Much appreciated; but come to think of it, more important for the canon of the main Q&A site and less so for meta.