I beat on my iPhone Pros and they have done just fine totally caseless for years (14P, 15P, 16PM), lots of drops to concrete. I did crack the back on a 16PM but that was a 15 foot drop to concrete; most cases would still have allowed the crack. The phone's operation was not affected.17PM - Cosmic Orange - 256gb
The only question is....Is this the year I finally go without a screen protector? Getting a black case so I can tone down the orange sometimes, but I am even thinking about not using a case now. I've got AppleCare One but I'm not intending to take advantage of it or waste my time getting replacement, so this is going to take some careful consideration.