Why does it matter what language I used to develop an application, if it produces a binary that runs acceptably on the platform and otherwise follows all of the

Why does it matter what language I used to develop an application, if it produces a binary that runs acceptably on the platform and otherwise follows all of the rules? I can write a more stable application in SML, Haskell or even untyped Scheme than most of the clowns I see making app store junk in Objective-C.