advantages of RPN

[Tugdual]

Interesting reading, thanks for sharing this. I personally don't value the number of keystrokes to distinguish RPN from other systems. It was interesting to see that if this number is always lower for RPN, it is not very different (<10%) and shall not explain all.
What matters in my opinion is the user interaction during the calculation. With today calculator, I see kids entering the calculation, i.e. copying what they see on paper to screen and then press '=' or whatever key that performs the whole calculation and gives a result. With RPN, you cannot expect the calculator to do the whole thing for you, you need to think about the way you will approach the calculation and use stack. This is actually a weaker system until you understand that you are part of the solution and can make a difference .