1) No his complaint isn't valid. There are sensible defaults - it only becomes a choice if you install another app that does the same things. In this case Gallery is built in and Google Photos is well Google's. It's not as if every app has a choice on launch. And how exactly are you going to solve the problem of user not having tried one or the other if the user isn't willing to choose one? Throw him a training video for both apps? That sounds even worse.
3) The whole idea of Android is different things for different people. You don't go buy an $699 unlocked phone and use it as a Specifically Optimized for Carrier X phone. It is an unlocked phone designed to run on many carriers as possible. If you need to download an app or two for further customization that's not really a big problem. If it is, then you should've bought something from T-Mobile store that they've customized for you. Wanting it both ways while pretending to be a simpleton user doesn't warrant any discussion.
4) If you need a certain type of lock screen and aren't willing to install one - you should at least look at the phones in a retail store and pick the one with the right lock screen - you can find a lot I bet. Complaining about HTC having confusing lock screen is contradictory to entire point of how Android works.
5) Yeah, sure - but at least it works. What other better options do you have - not having it? That's a worse solution. But yes, Google can do some tightening up on both Copy/Paste and Back button.
> That's not what I saw
So you saw him giving a solution or two that is not "do it iOS way - including don't have a back button"?