What's with the upside down watch? That's news to me.
So you can look at it while shooting your pistol, or keep the bad guys from seeing a light reflection from the face, etc. Mostly because high speed low drag doods wear it that way and other HSLD doods wanna look cool, too.
I'll agree that it's a more convenient and natural location for the face and probably better, however it just kinda makes people look like a douche because of the supposed cool factor