When your advertising guy is being efficient

Yes but you're not really gonna screenshot ur own phone

I think I like some white space on the sides because it shows that it's the end of the image. If the frame hugged the relevant parts, it would be annoying to look at because if you look at a slightly off angle then you'd have a bit of cut-off on the sides from the raised frame.

True. It might be better for the white spaces to be smaller, but not necessarily gone then.