Interesting point. Didn't notice that, thanks. I wonder if making it thinner would even be possible without seriously reducing the stability? And at the least the corners should stay 'thick' , as those are the areas most in need of protection by a case.
Though I at first made (well adapted) a flip case as a 'quick fix' in lack of something better I am getting used to it, and as I see the images here, I doubt that the overhead size is much bigger than this type of dedicated case. When you make the flip case like a japanese book, opening to the right in portrait, the flap does not interfere