They, canon nikon pentax? etc surely know more than me too, ,, but the thing is they ,, understandably , dont want to anything that will cost them profit.,or might alienate old customers. My interests as a consumer, are not precisely in line with their goals as a producer. I think they have a vested interest in making sure one is never quite satisfied with the current products. For instance Theres zero real reasons why they cant present the full gamut of RAW data on a histogram, There's no reason why one couldnt get a brightened jpeg preview of the photo as its shot at base ISO so you could see what youre doing., and theres no reason to provide ISO 1Million.
I see lots of great photos using ISO , including Blacktops Flickr. But Im still attempting to push what the camera will get me.