So you are again running away when your statements without any evidence to support them is challenged.
"What are you saying the camera manufacturers' engineers and/or scientists are saying that is all the same?"
the problem is, just shutter + aperture combined are useless.
You have brought this same lame argument many times and the reply is the same. When you say it's a problem, you are speaking on behalf of yourself and probably others who do not properly understand what exposure* is and what does and does not affect it. You are certainly not speaking on my behalf because I disagree with your statement.
I don't need to consider ISO to set my optimal exposure**. The camera can set ISO wherever it likes after I have set the exposure* as long as important highlights are not clipped. I set the final image lightness in post.
without iso, exposure has no practical use.
That is total nonsense because as I posted earlier I can change the image lightness with ISO without altering the exposure*.
I set the optimal exposure** and then let the camera set ISO where it likes as long as highlights are not clipped. I set the final image lightness in post.
* exposure - amount of light that struck the sensor per unit area while the shutter was open
** optimal exposure - the maximum exposure* within dof and motion blur requirements without clipping important highlights.
*** under exposed - more exposure* could have been added with the DOF and blur constraints still being met without clipping important highlights.