I just read this blog post. The following quote sticks out:
There is no (good) community that can form around “let’s just talk about everything and tag it".
To be honest this sounds like a hypothesis. In fact, this blog post provides no evidence to support this hypothesis. So let's be scientific and make some! There is the Area 51, so why not create an "everything group". If it sinks then the hypothesis is proven, end of story. If it succeeds, then you get a larger userbase. What do you have to lose?