I know this is not a SLS Paint Scheme debate thread, so lets just see the real thing when it comes out, until then, the NASA DRM, PPT, and PAO images will have to do, everything else is just speculation.
On a side note, the white and black checkerboard paint scheme is a high visibility scheme meant for ground camera tracking. It was mostly used on test launches, but in the Saturn V era, most vehicles carried it, as NASA was still testing the system through it's eventual cancelation. The Saturn V was never really considered a "Production" rocket.
FYI
Organic coatings primary purpose is to prevent corrosion.
Secondary considerations include but are not limited to; Visibility high or low, Heat reflectivity or absorption, Light reflect/absorb, aerodynamics when used in concert with aerodynamic filler puttys and adhesives, and as a sealant such as scuff/water resistant surface qualities. Of course there’s the obvious aesthetics.
Organic coatings add weight to any object, and in space systems weight is a major factor. In many cases paint is eliminated whenever possible for that very reason.