I don't think Moxie's right though; you can still do your own thing, and have it work best with your clients which support all the features, and then allow it to federate or optionally allow third party clients on your server with limited functionality. Naturally, you can also contribute back new extensions that you develop too so that other clients and services can adopt them if you want.

But I do tend to agree in general that we need fewer features and less complexity and to push more for basic profiles that everything should implement and that have a clear compliance label.