I think your list of what one loses without ‘Sacred Tradition’ is a bit brief, but I thank you for agreeing that they are not found in scripture, unless read in to it.
It wasn’t a complete list, though it has immense implications for Christianity. If you add “God” as taught by Calvin, well, quantity is overwhelmed by quality.
The Communion of Saints and the Real Presence are in scripture. They are an example of very important things lost by Protestantism - an example of how scripture alone does not work.