You are not limited to developing native apps, in fact, even if you are comfortable in developing in Obj-C, for applications of a certain size using PhoneGap or YUI to make cross-platform WebKit based normal apps is perfectly reasonable.
For apps of significant size or those with performance issues, it is not unreasonable to expect to have to use one native language, such as most game consoles do, or even Android does as pointed out in your link: "If you have performance concerns for your application, it's probably better to use the standard Android SDK (or NDK) where you'll have more control over the system."
Sure you could write a huge app in ASE instead of being restricted to Java, but its not recommended. In the same way you can write a huge app in PhoneGap over Obj-C, but it is not recommended.
For apps of significant size or those with performance issues, it is not unreasonable to expect to have to use one native language, such as most game consoles do, or even Android does as pointed out in your link: "If you have performance concerns for your application, it's probably better to use the standard Android SDK (or NDK) where you'll have more control over the system."
Sure you could write a huge app in ASE instead of being restricted to Java, but its not recommended. In the same way you can write a huge app in PhoneGap over Obj-C, but it is not recommended.