Message: If one wishes to create images in RAW format exclusively (no jpg), what should the "picture style" camera setting be set to (e.g., Standard, Faithful, etc.)?
What do you choose in your Camera? Simply what looks best to you!
Take the same subject with each setting and choose…
But, ALWAYS REMEMBER, in your RAW image processing work flow, this "rendering" is just a starting point!
You can either, Calibrate your camera and use that setting as it will be the most accurate, or you can simply choose what's pleasing to you.
Later, if you wind up making adjustments in Camera Raw that you always prefer you can save those adjustments as your default Camera Profile in Camera Raw.
In Camera Raw's preferences you can even make defaults specific to the photograph's ISO.
Just set parameters for noise reduction in the Detail Panel in Camera Raw using photos with each ISO setting and save those settings for each IS0 setting in the Camera Profile requester...
Camera Raw will use those settings automatically when you load photos for viewing in the Bridge and editing in Camera Raw with those specific ISO settings and the Noise Reduction values set in the Detail panel.
(btw these camera profile defaults also apply to what you see in the Bridge.)
Currently don't know what to set?
In Camera Raw just set Adobe Standard and remember it's just a starting point based on what the Adobe "engineers" decided what is best!
As you become familiar with the program, and what you are seeing, you will want to change all that to your liking.