Again, when someone asks why they're wrong, it's not useful to tell them "but you're wrong". Parent poster already acknowledged that the combination of his ideas and the facts on the ground didn't make sense. What good does it do anyone to repeat it back to him?
I guess when you're absolutely sure that you're right, but the observation proves you wrong, you have to be prepared to consider the possibility that you're wrong.
The comment I was replying to was saying that the file system takes care of it automatically, so there's no purpose to arranging millions of files into directories. I'm not going to speculate how it all works under the hood.