OSD mirroring?

[lnx64]

I'm trying to figure out the reasoning why a monitor manufacturer, would bother to include the option to mirror the OSD? I was thinking, perhaps if the monitor was mounted in some cabinet that bounces off a mirror, so the image looked correct, however, it only flips the OSD, not the video signal itself.

So with that, I'm not sure why it's there then, why flip the OSD, but not the video signal itself? Seems kind of pointless, but I am sure someone will prove to me why it's there.