setPriority() for Request

After reading the documentation and looking into the Request.java file, it seems like there is currently no option to easily set the Priority for a Request, neither via Setter or Constructor.
Is there any particular reason for this?
I already found posts on [Stackoverflow](https://stackoverflow.com/a/17641225/8331157) on how to get the desired functionality, but as basic as this is, I'm still curious to find out why the 'obvious' way hasn't been implemented, as I guess there is a good reason for it.

Thanks for any clarification.