I use Android and once a phone is nearing the 3/4 mark of it's useful life, I pull the cases off because at that point the smaller/sleeker form factor helps offset the annoying performance degradation. With my Nexus 5, which had a grippy back, the screen is still intact to this day. My Nexus 6p, which has a metallic back, slipped out of my hand the very first day I took the case off and the screen shattered.
My new strategy is to just buy a mid-low range android at the end of the sales cycle for a steep discount. I got last years Moto G Power model for about 40 bucks. Once I get about half way through it's useful life (~2 years), I am going to take the case off and I am going to scuff it up with sand paper and then spray on some truck liner or other grippy surfacing agent.