I am confused on the relevance of this question

My obtuse point is that though sorting your source code files into various directories offers no functional benefit*, some folk find it useful from an organisational perspective. Maybe there's an element of that in housing functions an object.

*bear with me - admittedly there are languages/technologies where directory structures are required, but hopefully you get my point.

My point was that if a function in your language is

    class {public function call() {...}}

then it is going to be unergonimic to write what other languages write as

   array.map((elem)=>{...})