Of course everyone is using phone cases - without them, hardly any smartphone would last a month without needing a screen replacement.
(It was better a decade ago, when smartphones were still thick and made of hard plastic. Now that they're all thin and metal, they're too slippery to handle safely.)
I'm not using a phone case, never have. You can have a smartphone for many years if you don't mind micro-scratches. Just don't drop it too often from too high up.
(It was better a decade ago, when smartphones were still thick and made of hard plastic. Now that they're all thin and metal, they're too slippery to handle safely.)