Eww, why do you want to control everything from the touch screen? I'm always bothered by people who insist that any game on DS must take full advantage of all of its features. :|
It's Nintendo's current handheld, a game can take advantage of some of the technology of the DS while leaving other things out that just aren't right for the game. Some RPGs on the DS are still in 2D but they're still perfectly enjoyable, even if the DS can handle 3D graphics. That's why I was always like "okay shut up" when people complained that battle scenes in D/P were still in 2D sprite form. >_<;
Anyway... </rant>. Sorry. XD;