@PerfectDark I don't mind wear and tear on the casing, just on the screen.

Thing is, I've had scratches happen even on tempered glass screens before. So I'm a little bit more paranoid than most. (I've also had a PDA come out of a pocket with the screen completely busted and broken beyond use before, but I'll admit that's less applicable to modern screens probably. Still, it's a thing...)

I will always love the clamshell design of the NDS/DSi and 3DS the most personally. I wouldn't mind seeing a PSP/Vita style design where something just flips over to protect the screen mind you. That can work with almost anything, but no one does it. Still, the clamshell offers extra thickness and flexibility so it really is the best design for a pocket.