My Dell Axim X50V would like to disagree. I installed several free applications onto it that came from individual, unaffiliated developers. This device is, IMO, smaller and lighter than the iPhone. Still, no tradeoffs required. And it does multitasking too :-)
To me, this is basically a huge quality control thing. If someones iPhone or iPad starts having horrible battery life, or becomes unstable Apple will be blamed.
That is just as possible as Ford being sued by a race car driver because his fuel efficiency is not on par with what was on the window sticker :-)
In terms of "being unstable", the last OS that allowed wayward apps to kill it was Windows 95. Fifteen years passed since then; why can't we expect Apple's OS to be in firm control of the applications, just like every other modern OS does? Apple's way is the DOS way.
Most people are willing to make the tradeoff
I seldom pay attention to popular opinion, it is often wrong. It's too easy to coax the public into believing whatever you want them to believe. I think no examples are needed in this forum :-)
FWIW, MS is going to a very similar model to Apple for WinMo 7.
It's because they are stealing Apple's business model :-) MS thinks there is a market for locked-down devices. There is a market for anything, but what matters is the size of that market. Apple is already at the brink of saturating the market with iPhones (who wanted them already got them) and I don't know how many new phones of this type can be sold. Anyway, if MS wants to play this game they are welcome, but they are late and the game is almost over. I don't even understand why an independent developer would want to target WinMo 7 phones at all, unless there is plenty of WinMo 7 equipment out there. So it's up to phone manufacturers to decide how this ends.
Can't say I disagree with much of what you say beyond this point. Watch the iPhone market become officially unsaturated this summer when the new iPhone is released. Things like a rumored (certain IMO) high resolution screen, better reception, bigger battery and better camera will have the Apple faithful camping out for a midnight release. Add to it that its the latest greatest Apple product and you won't be able to navigate the streets within a mile of an Apple store in some California cities...
The implication that Apple's OS is NOT in firm control of it's applications is BS and you know it... Don't try to rewrite history, Graysard! Windows 98, ME, XP and even XP were still unstable and wayward Apps could regularly kill the entire OS in those iterations of Windows. Vista was NEVER really ready for prime time. It wasn't until Service Pack2 of XP, in August of 2004, that Windows started to become stable enough to not regularly crash the OS. OS X has been far more stable since the release of OS X in 2001... and has been far more OS crash resistant than Windows. The last time I experienced an OS crash of OS X was in OS X.1... in 2002.