You should probably take anything Ken Rockwell says with a grain of salt. He's not really seen as a credible source in a lot of photog circles and a lot of what he says on his site is more opinion than fact.
I think the best way to explain RAW vs JPG is that a JPG is a RAW file that your camera has processed for you using what the camera programmers feel are the proper settings, where as by shooting RAW, you get to process the image into a JPG on the computer, using what you feel are the proper settings. So it basically gives you 100% control over the final image.
I shoot RAW because I don't find it to be that much more work than JPG and I like that it gives me extra flexibility in tough situations or when I make mistakes.
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