I thought you were going to make a different point about interactions. On pretty much any CGI I've seen, contact with skin doesn't look real. It could be skin on skin, or skin against a surface like a wall. It always looks like two objects not really touching each other. A lot of CGI (like Pixar etc.) seem to prefer hairy animals or solid robots, presumably for this reason. It seems easy to get hair to look OK, maybe because there's enough noise in the interaction to distract us. But skin just never looks real.