Been awhile since I’ve used lwjgl. I was wondering if there were any improvements to JavaFX within lwjgl3? I remember seeing some stuff from Spasi. After some googling I came across another project called JFXGL. It hasn’t been updated in awhile, but it /seems/ like it still works.
Was just wondering if anyone had any information on the topic 
The only thing I know about at the moment is, that you can use JavaFX to display a rendered frame buffer. You basically use JavaFX components with OpenGL in the background.
JFXGL seems to be discontinued as you said. But it still offers a lot of interesting things. It might be still worth trying it out.
Unfortunately JFXGL has speed issues.
Creating about 50 node objects (trees, panes, anything really) brings it down to a crawl on a powerful desktop computer. So it’s not useful for practical applications.