Why should Java 8's Optional not be used in arguments

Question

I\'ve read on many Web sites Optional should be used as a return type only, and not used in method arguments. I\'m struggling to find a logical reason why. For example I h

Answer 1

I think that is because you usually write your functions to manipulate data, and then lift it to Optional using map and similar functions. This adds the default Optional behavior to it. Of course, there might be cases, when it is necessary to write your own auxilary function that works on Optional.