This isn't true. I have gone naked since the iPhone 4 and I have NEVER dropped my iPhone or had a scratched screen. You just have to know how to handle it properly. I dropped a weight on my iPhone 12 once and used AppleCare to get an another one, but I have never dropped one. Since the weight mishap, I did start putting a case on at the gym, though.
I always take extra care of my gadgets, you can say I worship with my gadgets.
But I would like to share my past from my first full touch screen smartphone till now....
Nokia Lumia 900 was my first smartphone with full touch screen capability. The company made strong claims that it has Corning Gorilla Glass 2 which is strong, scratch resistant and bla bla. In few months I noticed a micro scratch on the screen, which was only visible if someone closely observes it, that scratch didn't affect the touch screen functionality, but like I said that I worship with my gadgets and love to keep it in brand new condition, so I wasn't happy. I took it to the company and asked, how can something so robust have a micro scratch like this, when it never fell from my hands. The guy sitting in the desk said, I must have kept it in my front pocket where my car key was, so the key must have caused that micro-scratch.
In couple of months, I upgrade to Lumia N920, the first smartphone with OIS, I used screen protector to ensure that it doesn't have a micro scratch, but no case, because Nokia claimed that N920 is a tank. Its body was made up of glossy poly carbonate, so I saw micro-scratches on back. Glossy surface is always vulnerable to micro-scratches, even if it is in a jeans pocket, where the rugged fabric of denim must have caused those micro-scratches.
Next year I upgraded to Lumia N950, whose design and camera I was really impressed with, and that phone came with an insurance. just one month after the purchase, my wife tried to take family picture and that phone fell from her hand and it was dead. But I got a new phone from the insurance.
My first iPhone was iPhone 6s Plus, it was lucky enough that survived up to 4 years, without any fall, but its screen protector had plenty of micro-scratches, I upgrade to iPhone XS Max, it slipped from my hands twice when I was holding it while walking in a party, but thank God, no dent, no scratch no damage, because of the tempered glass protection case. 3 years later I bought iPhone 12 Pro Max, before using it I immediately got a tempered glass protection and case. It fell once, from the bed when I was sleeping, its tempered glass had few cracks and dents, second time it fell when I was driving, I always connect my car infotainment with my phone and sometimes change the track, so while putting it back in pocket, it fell and the tempered glass protection had some more scratches. The next day I got the tempered glass protection replaced, and my phone looked like a brand new device. But few months ago, I was walking in my park, listening to music while holding the phone in my hands, it slipped, fell on rugged surface, despite having case, not only that portion of case was badly damaged, but the stainless steel frame also incurred bit of a micro-scratch.