Several people (both internal and external) reported FXML Login demo to be confusing.
Next improvements were suggested:

1. Add default login and password values in main window
2. Add description of what is being demostrated, e.g.: "This demo presents UI built using FXML -- interface markup language"
3. Create more complex/appealing scenes. People tend to say they do not look polished enough for corporate demo:
  - strange alignment
  - very small font on "Subscribed to Newsletter" label
  - always disabled continue button
  - button logout which looks like hyperlink and is located on top
4. Add button/link -- "See fxml representing this scene"