I actually never figured out why the routine recommendation is to cut the fabric right sides together. I seldom cut out fabric that way. For one thing, I want to be able to clearly see where the motifs of certain prints fall onto the pattern or exactly where a stripe or plaid is. With the right side out, especially for fabrics that are not yarn-dyed, those colors and images are crisper and easier to see. Sure, I have to ensure that the prints/plaids on the lower layer are well-placed also, but I often check that or align plaids/stripes carefully before putting the pattern on the fabric layers in the first place.
Supposedly, the logic behind cutting fabrics with right sides together is because it's easier to mark (really? with tailor's tacks why should it make a difference, and with tracing paper, it's more cumbersome) and because with the right sides together with some pieces, they may be already in a position to sew (really? how often does this occur in a single garment?).
I hope someone who is a wiser sewist than I can point out the advantage to cutting out fabric with the right sides together. I know there must be a good reason for it or else it would not be a recommendation in almost every basic sewing guide I've ever come across.