Buy a good quality tempered glass protector.
Get one that's ultra thin and has tapered edges.
It won't affect performance of the device and gives you peace of mind.
Gorilla Glass 4 is tough, but will still scratch. Biggest enemy of all these screens is not car keys, money or scissors as many of the test videos on YouTube show off, it is in fact simple little grains of grit and sand.
Grit and sand even just the smallest amount in contact with the screen (perhaps little sand or grit in bottom of a pocket) rubbing against it will scratch it ....
So if you live by the coast / beach or in an environment where sand & grit may feature - definitely get the tempered glass protector.
Heck this is a $700 phone, get one for peace of mind even if you don't.