I'm kind of summarizing this for myself, but hopefully this will help anyone joining into the conversation. I'm hoping to write an article on it later.
The problem with modern camera modes is they are out of date. Manual doesn't necessary mean fully manual. And automatic doesn't mean fully automatic.
Let look at the classic camera....Four modes which controlled whether the camera controlled aperture, shutter speeds, both, or neither...
Manual - Camera controlled nothing
Aperture priority - Aperture was manual, but shutter speed was automatic
Shutter priority - Shutter speed was manual, but aperture was automatic
Automatic/program mode - Aperture and Shutter speed are both automatic; The camera is making all the decisions;
Notice that nothing is said about ISO. While it was possible to set/change the ISO, generally it was fixed to the actual speed of the film being used. Without changing the film, it wasn't possible for ISO to be changed.
With digital cameras, ISO became as adjustable as aperture and shutter speed. What this really meant was we no longer need 4settings, but 8. Cameras could have been change to have
Manual & Manual ISO
Manual & Auto ISO
Aperture Priority & Manual ISO
Aperture Priority & Auto ISO
Shutter Priority & Manual ISO
Shutter Priority & Auto ISO
Auto/Program & Manual ISO
Auto/Program & Auto ISO
No camera does this. Nor have we gotten away from the program modes and simply switched over to a menu where we set each of the 3 possibilities to either manual or auto. This probably would be too foreign for classic photographers, but would get everyone in the right mindset. Instead, we left the four original settings, and have a separate ISO setting that is either the manually selected ISO or "Auto".
However, camera manufactures are forgetting that the classic manual mode, may still contain an automatic setting (ISO). If this is automatic, and EV adjustments aren't allowed, you actually have created a new, worse form of automatic. A situation where your manual settings of aperture and shutter speed, get ruined by the cameras automatic select of ISO. No matter what changes you make the camera can continue to make your exposure too light or dark.
This is the crux of the problem. Automatic mode can be partially manual (by manually setting the ISO) and manual mode can be partially automatic (by having the camera automatically set ISO). We need both photographers and camera manufactures to recognize the new combination of modes and fully support them. That means EV adjustment for everything except total (Aperture, shutter, ISO) manual mode.