You don't have to take out all the detail, but a lot of it does need to be knocked back a good bit in the wrinkles and such. Otherwise it looks like dirt. And the splotchiness. Oh my gawd the splotchiness. It's very easy to spot a skin that was cobbled together in photoshop, most of the time. Skin texturing is very much an art form, yes. And there are artists that can air brush skin textures in zbrush that looks just as real as any photo. I understand artists who are just starting out and don't have a lot of resources to put into their software, that's fine. I'm not pointing at them. But for those artists who have been at this a long time and are making a living from it, there's no excuse for them to not have the proper tools (software) to do the job the way it needs to be done. And displacement maps are not that taxing on a machine these days, if the machine is worth using.