Indeed, straight photography contains no inside information, does not require an MFA to understand nor big words to describe. It does not make the viewer feel superior for having understood it. What fun could the cognescenti possibly have by embracing such a low art form?
What straight photography can do, when practiced at a high level, is describe the essence of the time in which we live in a way that any person with functioning eyes and a brain can connect with and draw something from. It is simple, and often, simple can be very hard to do well.