I appreciate the sentiment, but.... I have an iphone 14 Pro Max (1st gen Ceramic shield), which has a good case w/ high lip, but no screen protector. I am very careful with it, have only dropped it once, and it is carried in a pocket with no other abrasive materials (maybe cash, maybe a thin leather billfold, but generally on its own).
Despite this I have acquired multiple small scratches on the screen. They are not large, not really visible when the phone is unlocked, but up until a year ago it was still without any scratches. Apparently the 'Ceramic Shield' has coatings which degrade over time (also, I live in a place with intense sunlight). Perhaps the glass is not scratched, but the coatings are - but I have no means to polish the glass.
And the glass on your phone is always 2x or 3x or 4x or 10x better than the previous gen. Whatever that means. I treat a dinky budget android phone the same way, and in two years, no scratches (of course time will tell, and it sees much less use).