I'd rather have an app with unnecessary options that nobody will ever use than one where some UX expert somewhere has decided the exact way I have to interact with the program.
There was a point in time where first person video games couldn't make their minds up and so games came with the option to have the y-axis inverted. Moving the mouse up would make the PC look down and vice versa.
I blame macs for this. The mouse should move the viewport, not the content, and touchpads/touchscreens are not mice. Having mice default to moving the viewport and touchscreens/-pads default to moving the content is perfectly natural.
I love the natural direction for my track pad and phone, but I'll die before I use it on my mouse. I have to use a 3rd party app to make my mouse behave the way I want and still use a track pad
It's supposed to mimic how you scroll on your phone. Fine for TouchPads (depending on when you learned to use it(i.e., if you learned to use a touch pad after learning to use a smart phone then it would make, slightly, more sense)), abhorrent for mice.
I have natural scrolling on for both mouse and touchpad, I like it much better. It's a pain in Windows though, have to edit register to change wheel direction.