You should try explaining some business logic to a non-technical person some time. If you are able to properly model the problem domain, non-technical people have a much easier time understanding the flow of the code and how it works if it's written in an OO way. This is precisely because they recognize the concepts and ideas they are familiar with and can already reason about. They know that 'a Person pays their Bills by asking a Bank to deposit Money'. This means they can make sense of code that is structured in the same way. FP, for all its advantages and elegance, doesn't offer that same correspondence.