Originally posted by Pioneer So, if all this is true, then why has it suddenly become so imperative that all of us buy a new digital camera with greatly improved high ISO performance? Everyone is doing it, Canon, Nikon, even Pentax. Most of the older ones were decent up to ISO 800 or 1600, but suddenly those old standards are no longer good enough. My newish Pentax K-7 can be used up to ISO 6400, although most people will agree that ISO 800 or 1600 is still a more reasonable choice. But all the reviewers have run down the K-7 because it did not have adequate high-ISO performance. I have even read some reviews that have actually said that you would be further ahead to buy the K-X for the much improved ISO performance. What??? Buy an entry level camera just because it can capture images at one or two stops higher ISO? Are you serious?
You could of course apply this way of reasoning to any technological development in photography. Why do we need continuous autofocus nowadays when people were taking perfectly fine photographs with MF decades ago? Why do we need more FPS, why high-res displays, etc etc etc.
I don't know who wrote up what you found online. To me, good high ISO performance matters. That's all I can say, and that's all that really matters. I have spoken to a person who shot analog with an old Canon EOS body, and she claimed she could shoot handheld with exposures up to a second or so. That's fine. I can't, and that's also fine. That's not to say I am not improving my skills. But still I sometimes use ISO 4000. And frankly, I don't care what a website says about that.
I attended a lecture by Bas Meelker (famous nature/wildlife photographer) a while ago. One of the things he said was that nowadays, we can capture images we just couldn't back in the day. For example, tracking AF allows capturing birds even at long focal lengths. These are tools that have become available. Sure, to the president of Pentax/Canon/Nikon, it's just a way to sell more cameras. What did you expect? They make money by selling cameras. That's not good or bad; it's a fact.