The L3 and R3 buttons aren't the Dual Shock 2's primary controls, nor are they used as a hardware selling point, nor are they touted as a "revolutionary" way to control games. The DS is built around its dual screens and touch-screen; the Dual Shock 2 isn't built around the L3 and R3 buttons.Originally Posted by Sylentwulf
A fairer comparison would be to the DS's built-in microphone. Like the L3 and R3 buttons, it's a secondary control option, not a central aspect of the hardware.
Again, if DS games don't use the second/touch-screen, there's no point in having that second screen to begin with. If you're going to develop a game that doesn't use the touch-screen, you might as well develop it for the PSP, which has superior hardware and superior controls for conventional (analog/D-pad) games.
-- Z.