Here's a fun example for what you can do with Scene Nodes: You can implement even a game! I added comments to the node graph, I hope that helps if you are interested in the example.
Here's the C4D file, it requires 2023.1:
tetris.c4d
tetris.mp4
To play the game, you have to press the usual play button in Cinema, and then either use the arrows for the Move/Rotate/Drop user data of the Keyboard Handler to control the game
or install these Python scripts and assign shortcuts to them with the script manager.
tetris_scripts.zip
For a new round you have to reload the scene.