On 2, third-party apps have long supported opening in a different app. Of course, it's up to that developer to include the x-callback-url and Apple apps won't use that preference.
And yes iOS8 does provide better extensibility than it did before and yes you would be able to open content in alternative browsers. Not sure about apps like Mail however.
> And yes iOS8 does provide better extensibility than it did before
That wasn't my point. I asked specifically if iOS provides better extendibility than _Android_ (as the OP seemed to infer by stating his move back to iOS for that reason alone).
> not sure about apps like Mail however.
That's the point. Browser was just an example. Extendibility of a system does not mean in one or two places.
If the extensions stuff is "good enough" for the reasons people like intents, then that could easily be enough for people to switch from Android to iOS assuming they like iOS better overall.
What I meant to ask was, what do you mean by "enough"? Does this mean that:
1. iphone/ios/Apple suddenly provides better extendibility?
2. Would you be able to, say, open a link to any browser of your choice in iphone?
If any of the above answers is "no", then, yes, I am not sure if you were serious or not. Hence my comment.
(Edited for clarity)