That gets even more true when you look at the RPN calculators used for engineering, science and business - all have special use cases. There are even calculato

That gets even more true when you look at the RPN calculators used for engineering, science and business - all have special use cases. There are even calculators to make construction estimation easier too. Most people who are just using it as a tool to figure something really quickly have probably moved on to use something less specialized, like their smartphone.