I do agree the mobile is not a good thing. ppl are distracted enough when txting or talking while driving or walking. yes Ive had more than a few ppl walk right into me while standing still. in their defense: I am small and hard to see as I am only 6'6" and 240 pounds - so you might walk into me as I am hard to see. lol
now on a tablet or a notebook that requires you to stay still and play the game effectively might be a fine thing.