Yeah, to me, although not one handed as I have quite small hands, X and XS were good to hold, even better than f.e. iPhone 11 6.1 . They had normal glass back + stainless steel sides. They were the least slippery ever. But very heavy which really outweighs the least slippery point.
To me at least the 11 Pro Max could not be hold without a case, hell even the normal 11 Pro. It was BIG, HEAVY and had frosted glass. Frosted glass in comparison to glossy glass is amazing to look at but a nightmare to hold caseless. My iPhone 11 6.1. f.e. is good to hold but too big and too heavy to hold it comfortable!
I really don't know if to get Apple Care+ for it. On the one hand, I wanna use it caseless most of the time, and it is small and light, so shouldn't have that risk of dropping. On the other hand maybe this is exactly why it could be dropped more. Too light. I don't know. Only thing I know is I will buy my fave screen protector as soon as it becomes available. My 11 looked horrible after only one week with no keys etc. in my pocket.
Will you all who go caseless buy the AC+ ?