There is nothing wrong with using jpeg. All cameras do shoot in raw, then built-in conversion software adds sharpening, NR, contrast, adjusts exposure, and converts to jpeg. Once it is finished, its baked in and you can't back out.
So, its merely a choice of letting the camera do the conversion according to a formula that guesses right XX% of the time, or letting a high powered computer do a more thorough job of processing it, and allowing you to back out the conversion and change it if the software guessed wrong. Along the way, you can do some tricks to enhance difficult images like selective NR and a host of others.
For many, time is more critical than having to tweak a image, so they take the jpeg route, and for them its the right solution.