"While in Android or iOS your application is suspended when you switch to another one"
That's not correct. Android has multi-processing. The Android runtime enables Service components to run in the background, and has preemptive thread scheduling, and has had these features throughout all publicly released versions of Android.
In my experience, Android multitasking still doesn't work like a desktop (or even my old n900.) Certain applications (those registered as services) can continue to work in the background, but many suspend entirely.
Sometimes I want to do something else while I wait for a large web page to load over my mobile data connection. On my n900 this worked fine, but as soon as I switch to another task, Chrome on Android 4.2.2 quits loading the page.
Plus, task switching is still a heavy operation on Android - swapping back and forth between two applications is a bulky, slow operation compared to the n900, which, itself, was bulky and slow compared to a desktop window manager.
That's not correct. Android has multi-processing. The Android runtime enables Service components to run in the background, and has preemptive thread scheduling, and has had these features throughout all publicly released versions of Android.