I think you're objecting to different things than the author. The author is complaining that there's no link or information that first_argument or second_argum

I think you're objecting to different things than the author. The author is complaining that there's no link or information that first_argument or second_argument are used by add_numbers. In comparison, in the Apple API example you've given, addRequest is explicitly provided to perform. What you appear to be objecting to is setting up potentially complicated config objects to pass rather than passing simpler arguments.