Every sim starts out at some point a "zero-slider" sim when first opened in CAS unless you use @igazor's tip on NRAAS SP to draw your newly generated sims from the bin of sims that you've created. It's how we craft the sims into what we eventually use that turns that zero-slider sim into a sim whose stare doesn't look vacuous and blank as if you shine a light into one ear and see that light projected on the wall opposite. Believe me, I've worked with real humans like that, where you wonder if their cranial cortex is actually functioning - it's the main reason I got out of retail (sold cameras for a while too) and went on my own to do photography. I need to get a t-shirt that reads: "Does not play well with others".
Sometimes I like working with zero-slider sims to mold them into the sim that I want in the ultimate end to play with. It makes it easier to mold them to the shape that I ultimately end up with other than trying to correct them from the slider position that they originally were and then have to mold. And, you know me, I don't like ANY extra work in creating my sims that I want to play with - so I don't look down on zero-slider sims, they're the foundation of what I work with in CAS. Then I go in and add in the facial characteristics to truly make them my own.