Mostly to avoid compiling much code that doesn't actually get executed. For the most part you can do everything ahead of time via static analysis (Xamarin's iOS

Mostly to avoid compiling much code that doesn't actually get executed. For the most part you can do everything ahead of time via static analysis (Xamarin's iOS toolchain does this). The only exception is access of code via reflection, which is harder to statically analyze and will also invoke the JIT.