Yeah, I found a good person at Apple too, with this, though he didn't say it was a known problem, or how pervasive it is. It seems I always do find a good support person at Apple, sooner or later. One time, I think it was with the bad logic board fiasco -- I'm remembering it as 2011, and still titanium Powerbooks? Anyway, I had a couple of them fail, and sent it in and got it repaired, and like the fourth time after the repair I opened the box from Fedex and it was DOA. I was really busy with work at that time. The higher level support guy offered me a new, newer model laptop, which I very happily accepted.
For what it's worth, I just talked to my daughter who bought a new M1, hers an Air, on the same day I bought my 16" a few weeks ago. She has a lot of friends with new macs: "Nobody I know has had any problem!"
My current theory, worth almost nothing, is that there are micro-defects in some small percentage of these screens. My former theory, which I haven't discarded altogether, is that the lid is not structurally rigid enough, and it flexes/deflects too easily.