[aercolino]

For me it would be much more valuable if the programmer knew that a tree wouldn't be needed at all if expressions were represented in reverse Polish notation.

However, in the last 30 years, I needed to process expressions at work and by myself exactly zero times.

[barrkel]

Humans have to read these expressions and understand them for auditing purposes. RPN might be suitable to CS and mathematics geeks, but not everyone in banking has that background.