How is what you are describing any simpler than using manual exposure? Since any decent modern camera with Manual settings capability will have a "Light Meter" in the viewfinder, it is no more difficult to set up a full manual exposure than it is to use Aperture preferred with Exposure Compensation. Either way, you are adjusting two controls. Except only ONE of those ways will give you absolute, predictable exposure settings every time.

And, as someone else already pointed out; Aperture preferred, Shutter preferred and Auto ISO are ALL AUTO settings where the camera is making the final decision about exposure, NOT YOU. Unless you are shooting a static subject with your camera on a tripod, you cannot expect shot to shot uniformity in exposure unless you are on full Manual, since even slight shifting of the camera between shots can result in the camera changing exposure settings.

The only reason I ever use Auto anything is when I am just out doing casual photography ("grab shots") where I can't expect to have the time to set up the exposure and/or focus. In that situation, I will almost always use Aperture preferred and auto ISO with a minimum shutter speed setting if the camera allows it.

That's my story and I'm sticking to it.