> If you were paying attention, exclusive features for own products is Apple tactics, not Googles.

Yet Navigation is s a piece of software by google for google's platform.

> Actually, there were people asking why Google bothers with Maps and Voice for iPhone (i.e. why it is helping iPhone at expense of Android).

You seem unaware that Maps for iPhone is written entirely by Apple using Google's public APIs. As for voice, it's obviously because getting more people to use Voice plays to Google's advantage.

> If you know the answer why, you already know why Google doesn't play platform favorites.

because their platform (services) stand on top of other platforms.