AAARRRGGHHH!!! <snip>
I think it's because anybody who has tried it finds it natural and easy. Sure you could trace a spiral in/out like on the N900 or hit +/- buttons with a pen but it's by far one of the most natural and obvious gestures.
Also, haven't we solved the capacitive v resistive thing already. Capacitive won.
I don't see why the N900 screen gets glowing reviews either. Of the two I had, they regularly went out of calibration, scratched easily and had awful viewing angles. Even my SE P910i had a better screen.