Discussions affecting the whole community a.. Wikipedia:Centralized discussion for centralized discussion of policy, guideline, and infrastructure changes That is noise. This is the centralized discussion forum. It can handle more traffic. It's all threaded, attributed, dated, archived, and multi-cast. You can't even do that last one with a web page, unless everyone polls it, and most people do not know how to make a browser do that. The first avenue for sujjesting that something be deleted is the user who posted it. Discussion of policy and guidelines belongs primarily *and not exclusively* on the talk pages of the policy or guidelines, because you cannot lock both a talk page and a mainspace page, even if I hav seen administrators trying to do that.
Infrastructure? A few hundred newsgroups on are on this server dedicated to software. Assuming that any discussion forum is central, this is it. More people hav seen it. More people here are equipped to argue with it.