If you look at the SNES emulator for Android phones, you get the buttons superimposed over the game.

With a lack of hardware keyboard, capacitive screens are the only way to support multiple inputs.
This is not a problem with the N900 as the hardware keyboard offers that support.

As I see it this is the only real argument for capacitive over resistive.
For ideal function a resistive screen needs to be accompanied by a keyboard capable of multiple inputs.