This is very interesting. So when I get my phones, they immediately go into a case with front and rear protection, it's how I keep my devices in pristine condition. My new iPhone 11 Pro Max has only been out of the case a few times; when I got it and when I took it out to show a couple friends, and when I took it out to clean it. In all cases, it was not exposed to any hard or sharp objects on the screen.
The other day when I got home, after removing it to show a friend the frosted glass back, I took it out of the case to make sure to wipe any fingerprints off, and I noticed a couple small scratches on one part of the screen. It made no sense to me, I was super careful, and besides, screens aren't supposed to scratch that easily. My first thought was to take it in and get a screen replacement (yeah, sort of extreme) but then I decided it must have been that way when I got it and I just didn't notice (you have to hold it in the light a certain way to even see them) so I figured I would just ignore it for now.
Then, today I see this, and the 100s of other similar responses (so far) from other users. So, maybe there will be a resolution after-all. I am posting solely to add my voice to the awareness of the problem and to say it isn't just the people that don't use screen protectors.