Why can't I have unique sorting options for folders in Finder? For example, when I set the Documents folder in my user folder to "Sort by: Kind", it also sets the sorting option for every other folder on my computer. Can I have unique folder sorting options? Or is it impossible? 

EDIT: This is on El Capitan.
Indeed, unique sort order is possible. 


Open a new Finder window for e.g. Documents and 
Go to View > Show View Options or hit Command + J. 
Define your Sort order. That's it. Close the window
Repeat the step for every window. This way you can define the Sort order for every Finder window.