On the one hand the FXMLLoader provides a set of static load() methods which are also used throughout all examples I have seen so far. But theses methods are quite useless because if you use them you will never get access to the controllers and includes that were generated during the loading process. On the other hand the FXMLLoader provides a single non-static load method. In order to use that you have to instantiate the FXMLLoader yourself and then you have to configure it correctly which is very error-prone. Forcing people to write code like this is really not very elegant.

        URL url = getClass().getResource("fxml_example.fxml");
        FXMLLoader loader = new FXMLLoader();
        loader.setLocation(url);
        loader.setResources(ResourceBundle.getBundle("fxmlexample.fxml_example"));
        loader.setBuilderFactory(new JavaFXBuilderFactory(false));
        Pane root = (Pane) loader.load(url.openStream());

The static load methods should be converted into non-static ones and then the currently available non-static load method should be made protected because it does not make much sense for a user to use this method if in additon to the stream you have to provide the corresponding URL anyway.