I assume you are implying "access to all app providers on the phone of their choice". What about those app developers that have chosen not to target a market? For example there are plenty of app developers that are iOS-only, and some that are Android-only. Do you then force them to target both systems? (since the customers deserve it). Would you enforce this on PC developers too? I'd love to have native Microsoft Office apps on my linux laptop. But I'm not holding my breath.