I have almost never used a screen protector. Although I see their benefit and I think it's a worth-while investment, then just never seem to last more than a week or three before the edges start to lift and dust/dirt gets under it making it unsightly.
Every phone is kept in the same left front pocket with my keys. I don't get anything like the stuff you guys/gals are getting until the phone has seen about a year of use ... and even then, it's just fine, hair-line or "spyder web line" across the screen.
I've had this phone for a week now. It's been through the normal work week and then more as this time of year is filled with Xmas and Holiday parties so it goes from jeans during the day to slacks or suit pants at night. I say this to show the varied amount of environments (tight(ish) jeans to lose slacks) and the abuse a phone would take walking and or even dancing with a phone and keys in the pocket.
I read this thread and I get scared ... I take the phone out to examine it under a light bulb, then into the sun, and even into the garage where my sports car is kept and I've those crazy lights that show imperfections in the paint when polishing and waxing.
I am proud to say the glass on my LG V10 from Verizon ... is PERFECT. Sincerely.
I don't ever put my phone face down and I usually keep the face of the phone toward my leg when in my pants. Maybe this is all that's required.
However - my friend ALWAYS has one of the 'glass' screen protectors and magically, it never has an edge lift and looks like it's was put on yesterday, even though it's been over 6 months. It was dropped last week and the screen protector cracked, which probably saved the screen ... and I've been thinking about getting one for this phone ... I just never get around to it ... one of these days I just know my luck is going to run out.