Indeed, Johan Vos of Gluon is the leader of the Project Mobile.
Swing remains a decent GUI toolkit, but it still requires native dependencies for stuff like OS file dialogs and other platform APIs, audio/video codecs, hardware-accelerated graphics.
Swing ships with the JDK, so whatever native dependencies are required, application developers don't need to care about them, unless they are making use of jlink, and to this day many still prefer to push to some JRE being installed, than making use of jlink and jpackage.
Which is why alternative JDK distributions still offer JRE variants, while officially from Oracle's side one should either use plain JDK or jlink/jpackage.
Swing remains a decent GUI toolkit, but it still requires native dependencies for stuff like OS file dialogs and other platform APIs, audio/video codecs, hardware-accelerated graphics.