It's basic engineering mechanics. All bending equations come back to the second moment of area [1], which for a rectangle is b*h^3/12. Double the thickness and

It's basic engineering mechanics. All bending equations come back to the second moment of area [1], which for a rectangle is b*h^3/12. Double the thickness and your object becomes 8 times stiffer. Second gen 10.5" iPad Pro (can't find dimensions for 3rd) is 6.1mm. Change that to 7.1, and it becomes (7.1)^3/(6.1)^3 = 1.58x stiffer. Not indestructible, but a massive improvement for a small change. 1) https://en.wikipedia.org/wiki/Second_moment_of_area#Rectangle_with_centroid_at_the_origin https://en.wikipedia.org/wiki/Second_moment_of_area#Rectangl...