Learning Functional Programming in Go

What possible benefits can this afford us?

Do we have to change our SQL query code to benefit from a database engine update that increases the query performance? The answer is no, and the same goes for our pure FP code.

What if all we had to do was write Functor(list).Map(add1) and define our custom add1 function? What if Functor was part of the Go Standard Library (or another very stable third-party package), and what if the next version of Go came out and it knew how to optimize performance based on the size of the list we passed it? Would that not be an automatic, significant benefit gained from simply compiling with the latest version of Go (or that other, very stable third-party package)?

This may not seem like a big win in terms of ...