I like the silicon apple case, Im disabled and use a wheelchair and have grip issues, the phone may look sweet without a case but for my needs the phone and case then go inside a neoprene shocksock sleeve and all is good hopefully. At the end of the day the lens is not pure saphire and it may scratch as it's not as hard as real sapphire glass, My 19 year old Tag Heur series 2000 still has no scratches but thats proper sapphire glass. With three lenses on my 11 pro, nope not taking that risk.
At the end of the day its a phone, its a tool, use it how best suits your needs and wants, For myself nope I use a case as I have enough issues without worrying about a £1500 phone, but do as you want, its yours. Just bear in mind you have three lenses and a square which feels like plastic and that may be more fragile who knows. Just enjoy it the way you want and always be aware you are carrying basically a glass sandwich around, which whether case or caseless can meet its maker very easily.
At the end of the day its a phone, its a tool, use it how best suits your needs and wants, For myself nope I use a case as I have enough issues without worrying about a £1500 phone, but do as you want, its yours. Just bear in mind you have three lenses and a square which feels like plastic and that may be more fragile who knows. Just enjoy it the way you want and always be aware you are carrying basically a glass sandwich around, which whether case or caseless can meet its maker very easily.