Honestly, I am curious about this as well...
Does the native email allow pinch to zoom or at least display emails to the width of the screen?
I just find it frustrating (in the gmail app) that emails are essentially shown in their original size and usually require you to scroll up, down, left, and right. I just would like to see emails the way you would look at a website in the browser. Get an overview and then double tap/pinch to zoom to the areas of the email that are relevant. Is it this way if you add gmail to the native email rather than using the gmail app?
What happens to contacts etc. if you delete the gmail app and use the native email with gmail?
I'm new to Android and am curious.