I have to disagree. All of the games you just mentioned are casual titles with little to no complexity. Action and platformer titles in particular require more precise controls. As a long time gamer on both consoles and handhelds, I can tell you that there's a definite improvement when I can physically feel the buttons and build muscle memory.
Imagine as a developer having to switch to a keyboard with no tactile response. A completely button-less piece of glass with virtual keys on it. Your productivity would no doubt diminish greatly.
In addition, a large install base of these kinds of devices would make it easier and more profitable for studios to port their games over to the iOS platform, giving us even more game choices in the app store.
Doesn't mean they aren't fun and popular games. I don't doubt that there are things buttons can do that touchscreens can't - I like my Assassin's Creed and Mass Effect just as much as the next person - but they're different animals, ones that take full advantage of big screens, complex controllers, and comparatively long play sessions.
A lot of iPhone gaming takes place in short sessions, and I'm not about to keep snapping a coco on and off just for five minutes at a time.
In any case, I'd prefer it if studios didn't bother porting their games over to iOS. They're optimised for consoles, not for handhelds, and even with a millions cocos out there, the economics probably wouldn't be that attractive to most big devs when set alongside the hundreds of millions of people who don't have them.
Imagine as a developer having to switch to a keyboard with no tactile response. A completely button-less piece of glass with virtual keys on it. Your productivity would no doubt diminish greatly.
In addition, a large install base of these kinds of devices would make it easier and more profitable for studios to port their games over to the iOS platform, giving us even more game choices in the app store.