While a significant part of us are engineers, some (like me) have to make their living in other duties - in my case, financial manager in an industrial company.
As I flat-out refuse to "wear" a financial calculator, I equipped both my 42s and 15c with financial formulae - at least the ones I use more. It is not only about the software, but how you use it - and it may be different in your case (For example, in my multinational no IRR calculations beyond 10 years - this limits the number of registers to be used and shortens significatively the program shown in the Advanced Functions Handbook - allowing for more programs or free registers. It is also about grouping new programs with related keyboard functions)
Here are "instalments" I and II:
How I have configured my HP 15c for financial duties (I)
The rest will come as I type them in EXCEL with the nice Luiz HP fonts.
(By the way - am I the only one "betraying" our engineering roots?)