Resistive screens have one, major, giant, super amazing (to me) advantage over, essentially, all other touch screen inputs: Accuracy. You can literally take a needle, and press it on a single pixel, and the system will know
exactly what pixel that was. No guessing. No fat finger. No fucked up magnetometer. No requiring tilt sensitivity.
It. Just. Works.
Given that the system has MOTHER FUCKING BUTTONS, why the hell should Nintendo consider smartphone gaming's control schemes? Why? What point is there? You aren't trying to use some shitty virtual dpad, or timing a tap to do a jump, or any of that, because you have BUTTONS. Multitouch is a necessity when all you have is a screen, yeah. But as an owner of a Vita, the multitouch has come off as completely non-factor, and in the case of Gravity Rush's slide move, actually a PITA.
So, given that multitouch doesn't mean jack flippin' shit, what does that leave? You have either incredibly expensive Wacom based tech (or one of the inferior competitor's), or resistive screens. Let's look at Wacom tech:
It's got pressure sensitivity, it's got fine points, and it's got buttons on the stylus! Holy cow! But wait, not even Wacom tech has perfect pixel accuracy!? It relies on magnets to determine the location of the stylus, but the sensor is actually about 3 or 4 mm away from the tip! Meaning the only definite lock the screen gets isn't the point of the stylus, but a small bit away. Tilt sensitivity and calibration can bring it to very close, but those are a pain in the ass to the consumer, or in tilt sensitivity's case even more expensive than what you're already at. And
still isn't pixel perfect at every angle.
Now, what are the disadvantages of resisitive?
Not multitouch. Who cares, doesn't matter.
Less responsive to very light touches. Well, that's what the stylus is for.
No pressure sensitivity. Yeah this one sucks, but it'd probably be by far the most expensive component of the device, given manufacturing and license. Not to mention $30 replacements styli.
Truth be told, I wish Wacom and their ilk would find a way to release a resisitive screen with the side buttons/pressure transferred over a wireless connection.
Outside of a phone, I
prefer resisitive, especially for what a gaming device needs.