By that logic, operating system developers struggle to understand that putting two files with the same name into the same folder(1) is very much possible in the physical world.

(1) or referencing them from the same directory, which was the earlier metaphor.

In the time it took you to write this comment, you've thought more about the abstraction than most of the people who are confused by it -- and it will never succeed to coax them out of their confusion with such logic. :)