I think that's a pretty terrible solution. If they don't allow permanent downloads of content I purchase, it's a nonstarter for me. I have a crappy DSL connection and can barely stream 480p. If I buy a movie, I want it stored for as long as I choose. Otherwise, why have 64GB of storage?
... and you're investing in an internet-driven set top box? Like buying a Tesla automobile when you live 5 hours from anything resembling civilization.
And as Apple keeps saying... APPS. That's why there's 64GB of storage. For most people who download internet video, that holds basically nothing and they know it.
Your expectations were seriously out of joint.
Given the reviews are out, I can talk about this now – I have a dev kit – the text input is maybe one of the worst I've ever used. Having to type in all your music searches? Forget it. I guess if they update the Remote app that could work, but Siri already works with Apple Music on iOS, so I don't see what the delay is.
p.s. the Remote is really unergonomic, as the touchpad is at the top. It's like using an iPhone 6 but only swiping on the top part of the screen. I can't imagine that their hardware A-team was involved in its design.
Putting it at the bottom isn't ideal, either, and the middle makes the touchpad far less useful as a game control method than it is already.
Amazon doesn't really make money on the hardware, they've been pretty upfront about that. What they hate is:
1) Apple asking for any part of their digital sales
2) Apple forcing them into strange workarounds which creates buyer friction
If Amazon Instant Video being unpresent were exclusively an issue with Apple TV, these arguments hold merit.
BUT, since people keep forgetting: What's Amazon's excuse for shunning Chromecast/Google? Google puts up none of these impediments, yet Amazon has no app there, either, and also removed Chromecast devices from being sold on Amazon.
So any reason proposed for Amazon not having an app on Apple TV gets thrown out and replaced with the most obvious answer:
Amazon wants its Instant Video users to use Amazon boxes, trying to be Apple without all the friction-free interoperability and multiple other hardware pieces of Apple's ecosystem that make that a less bitter pill to swallow, and blatantly shuns its biggest competitors by actively attempting to restrict competition in retail because it controls a major retail outlet and crying foul that their competitors are big meanies (while Google is giving them a WTF look over how much bullshit they're talking).