I like the idea of using the edge of the device as a scroll area. Maybe Apple tried it and it didn't work out, or it didn't translate well into zooming, or it w

I like the idea of using the edge of the device as a scroll area. Maybe Apple tried it and it didn't work out, or it didn't translate well into zooming, or it wasn't precise enough? (You can rotate a dial with a lot more precision than a big bulbous finger moving on the edge of a tiny device.) Regardless, I'm glad there is a way to scroll without covering the screen and adding more skin oil to it.