The glass back is NOT very resilient. it slipped from my pocket in my pants, while sitting on the terrace, a ca. 40-50cm drop, and the glass back cracked.
This is the ONLY time I dropped it, so it’s not like one time too many.
I’m never buying a glass back phone ever again.
Glass is not premium, it’s a design flaw.
I have used my phones without a cover since I got the LG G2 about 10 years ago. And for all those years it has been without incident. Although It has happened (rarely) that the phone slipped out of my pocket when getting out of the car. App the same drop height, and it was a non issue.