No one has answered my question about how you achieve proper exposure without considering ISO to do it.
See post #29, above.
No, in no way. That just keeps on talking around it, intently trying to evade the specific question. He should be a politician (meaning, a politician of the worst kind).

Along with his adding some really stupid stuff like: "ISO does not cause noise. If anything what ISO does suppresses noise. " Really laughable.
The question meaning was this: Suppose you want to take a picture of the crowd on Main Street, and you raise your camera to adjust for proper settings and do it. The Suns illumination does affect the brightness of the image you will see (as certainly also does the aperture, shutter speed and ISO selected), so there are the three settings necessary in an appropriate matched group for this proper exposure: aperture, shutter speed, and ISO. First Basics of photography. Each of the three requires selecting suitable choices for the situation (due to depth of field, motion blur, and sensor noise), or we could allow automation to chose something to do it (but other than exposure, it has no knowledge of the scenes actual requirements), but all three settings must absolutely be addressed. ISO is one of the settings we are required to make for a proper exposure (proper meaning so that we do get a usable image file with an acceptable histogram... there is no other way to get a proper image file out of the camera other than to select the three suitable settings). ISO is one of those extremely necessary settings to deal with, arguably one of the most important.
It is argued that digital ISO is just a gain amplification factor after actual instant of "exposure", which is just show-off clever in this context, but it is not useful in practice, or to newbies, since there is no other way to get the proper image file out of the camera without setting a suitable ISO too. Any image file and any histogram WILL have this ISO result in it. It is what the camera does. It is what ISO does. Setting ISO is one of the required ways we deal with situations, in order to get a proper and usable file out of the camera. The three basic essentials required for newbies (or automation) to get a proper image is aperture, shutter speed, and ISO. This was of course true of film too.
My question, still totally ignored, is: When standing on Main Street, how does one take any proper and usable image without concern for setting a usable ISO? It is not a question about semantics of terms, it is about when standing on Main Street, what does one do without setting ISO? Agreed, it is a stupid question (we all know the answer, we set ISO), but this has become a stupid thread.