I use a case because glass is just impossibly slippery. Breaking the screen is not the worst thing that can happen when dropping a phone. You could also drop it

I use a case because glass is just impossibly slippery. Breaking the screen is not the worst thing that can happen when dropping a phone. You could also drop it on someone's head or lose the phone by dropping it in the water (or some other inaccessible place) or because it slips out of pockets and bags so easily. I like my phones to feel rubbery. It makes them far easier to use with one hand as well.