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Well "non limited slip" is not really an option of the differential, its like the base model of base models, the vanilla of vanillas. You can only upgrade from "non limited slip", to a "limited slip", to a "lunchbox locker", and finally to a "selectable locker". And for others out there, I didnt mention a "welded differential" because its no longer a differential at that point.
Because it keeps the cost down and not everyone needs it. If you DO have one and drive on snow and ice it takes a bit different technique. A open diff will spin one tire but that will leave the other to help track the vehicle. A L/S may cause both wheels to break traction on snow so you've got to be able to correct it with the throttle and steering. I'd rather have power going to both wheels and drive it right, of course my '08 has traction control and no L/S.