That's a growing list of documents over the course of XMPP. It doesn't really prove anything other than... XMPP has been around a long time, and people continue

That's a growing list of documents over the course of XMPP. It doesn't really prove anything other than... XMPP has been around a long time, and people continue to develop it. People saying "look at all this stuff" is one reason the Modern XMPP project was born. To draw attention to the actually important things that developers need to read. The XSF receives a lot of submissions each year. Many of these proposals never make it past the "experimental" stage. Others are only applicable in certain domains (IoT, etc.). Over time some of these become widely adopted and progress through the standards process. Some do not. The XSF publishes annually the "compliance suite" which describes what clients and servers should be supporting in different areas: https://xmpp.org/about/compliance-suites.html https://xmpp.org/about/compliance-suites.html