Touching a touchscreen seems pretty standard and usual for touch-controls. The way you perform some super-moves in virtua-fighter compared to street-fighter is pretty non-standard !;)
Quote from TheGreenManalishi:
No touchscreens will never be an effective interface for a console because you never get a feel for them if they're forever changing depending on what game you're playing. That's why no FPS these days has a face button for shoot.