The bends that have been show here are in line with the antenna bands...so no those are not the “weak points”
A point where the device breaks is a weak point, irrespective of the technical explanation. Can you imagine a car company building a car whose suspension cracks when driving too fast into corners and then saying yeah, but we needed that for more comfort? No, there are engineers at Apple who have to solve that problem, creating a sturdy product with good reception at the same time.
And where does it show that it cant withstand "mild abuse"? All I see is some lunatics on YouTube folding iPads like magazines, scratching it with extreme sharp objects and torching them with lighters.
I agree with you that this videos are childish nonsense and a device certainly doesn't have to withstand every kind of abuse, however they are done with other products as well for fun. And it didn't really seem they put a lot of force on it, it basically cracked like an old branch.