It's true that since the original Jabber project began in 1999 there was a vision of giving users freedom of software and service, yet that vision is still nowhere near reality in 2019. But we are still an active community and still work towards that vision. XMPP is not dead.
Unfortunately Pidgin and Adium were two of the most popular clients for XMPP, and their development (in Adium's case) and XMPP development (in Pidgin's case) has almost completely stalled, which is unfortunate. Alternative XMPP projects are still very actively developed.
The XMPP community recently began holding sprints, where a bunch of us get together in real life to focus on specific topics, such as UX and interop. It's been great!