Most of the time during a conversation, people shift their hands to put the phone's earpiece nearer to the ear when listening and then the mouthpiece near the mouth when talking. The curved design would eliminate that. But it does look weird and makes the design not that pocketable. A flexibl phone would be nice instead of a permanent curve.
Don't Sit on that phone by even accidentally..Galaxy Round is horizontally curved which atleast fits in pockets ,G flax is vertically curved and not sure how would it fit in a pocket. swiping the screen from top to bottom will be easy.