[estel]

I guess this is more an argument about designers without experience of the platform - but most designers /don't/ have experience with iOS. Especially in an agency model it's easy to "receive" a design that uses very slightly non-standard controls, attempts to use Android UI paradigms in iOS (or vice versa) or generally make everything a pain.

For example, I've had discussions where a designer has insisted that the navigation bar is 50px high, which is a proper pain. (The correct solution here being to leave it at the default of 44px, safe in the knowledge that they'd have to be properly anal to count up the difference).