My limited understanding of scene nodes is that Maxon or any 3rd party developer can create assets that offer the same simplicity and functionality found in xpresso. So in the example of the two node process vs the 6 node process from page 3, the two nodes in the xpresso example could be recreated as scene node assets, with the user never having to touch or understand the underlying nodes. The diffence then is that unlike with xpresso nodes, whose functionality cannot in any way be changed, the user if so inclined can dive into the scene node assets and actually change or improve their behavior depending on circumstances. The same theory will apply to all areas of Cinema, which Maxon is in the process of rebuilding from scratch. The theory goes that the end user will be able to have the same easy user experience as now, but will also have the ability to dive into the node structure of any object, operator, or function for greater control if needed or desired. And it will all be way faster than currently possible. The question is not whether Maxon can technically achieve this goal, but rather if users are willing to stick with them for the years it will likely require. Personally, I regard R20 as the last version of Cinema 4D as we knew and loved, and everything that comes after as its successor.