Since when are exclusives an issue outside of console gaming? Even in console gaming - nobody cares that much. And furthermore, console gaming is not even nearly as important a market or as ubiquitous or as useful to society as smartphones are. The fact that some things are wrong with the gaming market doesn't really say much.
Anyway, app publishers like Spotify and Netflix have already offered lower prices when you signup outside of Apple's app store.
Sorry, but you're wrong. Giving customers a choice between shopping at Walmart, Target or Best Buy will always benefit customers more than only giving them the choice of Walmart.
There is simply no way in hell that you're going to convince me that having less choice is good at any level.
Competition is good, but they're not competing for customers - they're competing for developers, to the detriment of customers.