Hi!
Thanks a lot for the comments! We do work on an update, please feel free to add your ideas here: https://trello.com/b/ojeNlNyg
Regarding the strategy with creating two combine nodes from a factory node, then connect one to the other - this is legit, it helps a lot and we use it all the time. Maybe we should include it in a tutorial.
I added everything to the trello board.