I'd suggest going through the gallery, taking a look at the work there, and imagining what it would look like if it had to skin textures applied. Very scary and more than a little plastic, I'm sure. Textures add enormous realism to a model, if the texture is done properly. There are some out there in the D/Ls that are little more than a whack of solid colour and maybe a few face details, and those won't do a thing when applied. But then compare that with something like Catharina's hyper-realistic work, and the difference is obvious.