Yes, no case here. Just like my X, 7 Plus, 6S Plus and 6 before it. Haven't shattered a screen yet. And worst case I have apple care+ and have to pay the $99 deductible. I'll consider that a "no case fee" if that ever happens.
I think where this matters is in resale value. If you dont resell or are on the IUP then case-less seems appropriate. I would sure like to know under IUP how much wear and tear is too much from Apple's perspective.