I'm more concerned with the backwards movement of the controls to adjust the exposure using the built in metering on most cameras. Leica CL seems to be the only camera that intuitively has it right. Not sure about the M series but, suspect they are like most other cameras. Or how about the shutter release button. Being on the front means as you depress it, you are pushing against a surface with virtually no body movement, with it on op, you are pushing against nothing solid but your hold which is pushing up to offset it and hence greater chance of body movement especially with shutter releases that are stiffer. Or these electronic cameras that continue to default to some nonusable settings after each shot making you go through menu after menu to get back to the way you want to use the camera.