this argument is invalidated by Samsung successfully carving niches for a 5" note, a 7" tablet, and phones with wider and taller screens than the iphone's. the iphone itself has also grown an extra row of icons in height. there are criteria regarding screen size selection that have outgrown the original 'human hand' argument.
Rounded edges. Wow. Not having rounded edges are uncomfortable in your pocket. Oblong, well oval or round phones are not comfortable in your pocket either and you'd also like something that doesn't use more space other than to house the required components, of which the size of the touch screen is probably the most important factor.
I too, have 20/20 hindsight.
You also focus on the hardware design, and fail to acknowledge the blatant copying of the the IOS look and feel. it wasn't accidental, there are 132 pages which look at every aspect of the iphone with the intention to copy software features wholesale.
Most people handed the same components would come up with the same generic design.
This is precisely the argument, except the components were proprietary at the time. During the development of the phones in dispute, Samsung was responsible for mfg. parts for the iphone and ipad, including screen. of course they would have intimate access to the components ahead of the competition, which is how apple stays ahead. Samsung abused their agreements with apple, and were given an unfair competitive advantage./p