Having the pure Android experience isn't a huge step b/c it doesn't really provide anything that consumers don't have access to. I'd even argue that the big draw is the unlocked bootloader. With that, the product is considerably more intriguing.
The Hangouts issue isn't just an iOS issue. It IS still a multi platform issue. I'm just pointing out the huge issue that still exists, and that is being a Google (contacts + Chrome) specific service. But I read a rumor that SMS is coming soon, so that will knock down a lot of the barriers that is holding Hangouts back.
I don't understand your last point. Google could very well develop a Google All Access app... I mean iOS has Spotify and Pandora does it not? Again, I love the idea behind this product. But I can see where users would be hesitant to migrate to it. As for iRadio, we haven't seen what Apple aims to offer. But you're right, I'd have the same opinion of it.
I understand that hangouts is still not what people that it was going to be, but it is still not a bad thing. It is a step in the right direction. I think I have stated this before, but the only OS that will get SMS will be android. Apple will never allow hangouts to access the stock android app. Not will they allow an alternate messaging app. You can keep hoping, but I think as an iOS user if you are you will be disappointed.
You can disagree with me on the stock android, but me and a lot other people think it is an opening to put stock android on more devices.