@Antonela: Way to go, love it! Would be terrific to see if for other brands/sizes, but your thumbzone app is already a great little visualizer. Thanks for sharing it.
@Nyckie: My hypothesis (and it would be great to test) is that our thumb use has more to do with their importance in gripping things—and how thumbs naturally sit on top of objects we grip—than it does with past gadget experience. But you’re right that it would be great to get a detailed study on that. The study that @Nabil mentioned above suggests that age/experience don’t affect grip, but that’s more of a directional hint. Interesting!
@Cory: So right! This is definitely about touchscreen grips, and that varies according to other gadgets, screenless and otherwise. What kind of stuff are you working on? This stuff fascinates me.