Ignoring the topic of eye dominance (which differs from person to person) most 35mm cameras are laid out to the advantage of the right eye dominant shooter, just as most rifles are, too!
The average SLR has a shorter body section protruding to the left than to the right, allowing the photographer to open the non-viewfinder eye and see around the camera, which is important when shooting sports at the sidelines and seeing a running player coming in your direction! And when the camera is rotated CCW into Portrait position, the non-viewfinder eye still can see around the body of the camera.
And as you advance the film/wind the shutter, the rapid return winder lever does not interfere with your face when you aim with your right eye; it gets in the way and you have to move the camera a bit away from your face to advance fil/wind the shutter, when you aim with left eye!
In rifles, hot brass cartridges are ejected out the right, so if you used your left eye to aim, the possibility of hot brass ejected into your shirt is a danger. (Admittedly newer guns might employ a deflector to bounce the hot brass away from even the left eye rifleman!)
The M16A1 during Viet Nam conflict ejected hot brass to the right, and riflemen were trained to shoot thru the right eye aim due to the hot brass issue...you don't want hot brass at >600 rounds a minute (in full automatic) coming into your shirt!