If someone said, design me a shape that the human hand can grip easily and would not slip, you seriously think a
smooth faced thin shape would be deemed the ultimate?
Think about anything ergonomic. It's designed to fit the hand, be grip-able, non slip etc.
These items are designed to LOOK simplistic, neat etc.
They are in effect a non finished item, that an end user then has to fit into a case to either give it grip, protect it from damage etc.
Just google the word:
https://www.google.co.uk/search?q=e...ved=0ahUKEwiumZmg8sDOAhUFCcAKHUZtAg4Q_AUIBygC
The ideal shape is a shape that's designed for humans to use in their hands, to hold easy, to not slip from being held, to not break easy when dropped from a normal standing height.
These devices LOOK great to our current societies viewpoint on things, but in reality for a device held by a human that are about as bad as you can get.