That'd be a compelling argument *if* the DS didn't have the most primitive and glitchy 3D graphics imaginable. That was easy to overlook back in 1997, when 3D required a powerful PC. In 2004, the DS specs are shameful; if they wanted to keep costs down, they should've stuck to 2D.
Texture warping and pixellation should not exist in 2004's 3D, just as sprite flicker and slowdown were unacceptable in 1996's 2D. Even worse, the DS is obviously being poised as a 3D system (embarrassingly enough), and it doesn't even have ONE analog stick.
And outside of Gran Turismo 4 and select few other ports from the PS2, there's NOTHING stopping PSP developers from making handheld-friendly games similar to those you see on ther GBA SP and DS -- the only difference is, they'll look, sound, and control vastly better.
I'll take a vastly improved screen resolution, an optical format, and ridiculously superior feature set over an additional screen and a stylus ANY day. If hardware specifications didn't matter, as our naive little pal Reggie suggests, we'd still be playing the fuckin' Gameboy Color and lovin' it.