I think for Steamgames you should consister to buy a GPD Win, its a Chinese Pandora Clone, but whit a newer X86 CPU and Windows 10, some even got skyrim to run on it..
Pyra is more if you wants to play opensource Games, as they need to get portet to ARM..
But from my Experiences whit the Pandora, i would expect the durability of the Pyra quite hight, i allways carry my Pandora in a Sidepocket of my Workpants, and expeckt of some scratches, it still work quite well..
The Case of the Pyra is Scretch Resistent, EvilDragon showd this in one of the first Vidoes of moldet case prototyps..
and whit the Clamshell Designt which saves the Display, the Pyra should be pretty tought..
Not Waterproof and not that tought than the G-Shock Watch, and not that undestroyable than the original Gameboy, but it should survive lots of everyday dangers..