Thank you for the review and the video! You did great, maybe we should have made it more challenging. The suggestions are definitely good, we just didn't have time to develop this :/
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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.