I understand screen cannot crack by itself
It's relevant in that I've never had a similar issue with the same product until recently. Are you saying that the materials and manufacturing process and specs for the new screens can't be different than the older screens? That's what I'm comparing to - durability of the previous model to the current. So if I change manufacturing specs for the screens to make them thinner and lighter, you don't think they could be more prone to damage to forces when manipulating the lid? I'm the biggest Apple fan boy there is but even I can easily tell that it's easier to flex the screen on the newer models than the older ones. I still have a couple to compare to.
Even though it may not be right, I always associate higher prices with higher quality, not lower. And as far as quality, I include durability as part of it since this is a product that is meant to be moved around in different conditions.
Everyone has their own opinion of what is acceptable, I'm simply sharing my experience so others can consider it before making, at least for most of us, an expensive purchase.