The biggest problem with the RAW shooters they do not know how to shoot a perfect JPEG on the spot.
Why so they need to shoot a perfect JPEG (a superfluous exercise anyway). They know, how to shoot a perfect RAW, and that is plenty enough.
They go to their computer (time consuming) and they are forgotten how the scene really was and than they give a certain twist to their photo's thinking that was the original scene.
Perhaps your memory is so weak, not mine. Personally I don't think that in camera RAW converters (also called JPEG engine) have any particular benefit. Instead they are rather crippled compared to most RAW editors, and have the huge disadvantage of stripping away important data right from the beginning: JPEGs are limited to 8 bit color information. Why on earth, would one opt for throwing away this data already in the camera?
Do the test and you should be glad, do not use the extremes because that photo was not good enough right from the start.
JPEGs are per se never very good right from the start. There are many parameters, which should not be at in camera, because you can't really judge them on the tiny and dark camera monitor. Sharpness, noise reduction, color saturation, and contrast should never be done via the JPEG engjne, and should be postponed to post processing instead. This is how a proper workflow works. These parameter do irreversible changes to your image and these parameter are impossible to get perfect right out of the cam.
Also, one would be a fool, to adjust those parameters via the camera tools and menus, because that would be the most unergonomic way to do that.
The RAW shooters show you always very extreme lighting examples and think or say look at that what i have gain back, i say shoot your JPEG properly and than you gain all the profit from JPEG shooting.
You can't shoot a JPEG properly. That is inherent in this format. Data loss, no possibility to judge important adjustment parameters properly before you take the image, and so on, all this shows that it is much more advisable to shoot RAW.
Since RAW editors improve over the time, your older RAW images will profit from that too, but your JPEGs won't to the same extent. Another huge disadvantage for JPEGs.
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Thomas