When you hit the share icon in an app on the S5 you can damn near share with every app on the phone. iOS 8 still has few apps with extensions for sharing. This might change but it's still limited at this time. Very limited actually
Well, it's only been 3 days since developers were allowed to release updated apps with support so this is understandable. If it's not much different in a month or two, I'd agree it's a problem.