The “Protect saturated colors” intensity slider in the Color Rendering palette is an adjustment to the selected color rendering (defined by Category, Rendering, Intensity). Some colors can be rendered from RAW too saturated - sometimes to the point that there is clipping that causes detail to be lost in the monitor output or final export. The monitor out-of-gamut warning may be used to see parts of the image that might be clipped. The detail isn’t irretrievably lost if the camera captured it and you have a large enough working color space - though you probably want to change the rendering options if the colors are really bad. Raising the “Protect saturated colors” Intensity slider increases the adjustment to saturated colors so that (a) they are more within the visible gamut - less saturated - and (b) there is more microcontrast in those saturated areas so that tonal gradations are more visible.
The “Preserve color detail” slider is for soft proofing. It performs the same function on the final image, adding to whatever was done in Color Rendering.
Here is an example of all of this:
Note that the Soft Proofing destination out-of-gamut warning indicator is like the monitor out-of-gamut warning indicator in that it only shows what is being clipped in the selected color rendering. Adjustments made in Soft Proofing aren’t reflected in either warning indicator.
So I don’t understand this feature request. I believe its initial premise is incorrect.