It's not about the subscriptions it's about the rentals and the purchases, it could've changed since then but Prime Video doesn't support purchasing on mobile which makes it irrelevant for the TV.

>This is the problem, not the solution. Nobody wants one device per service. I don't want an Apple TV for Apple stuff, a Fire stick for Amazon, a Roku for something else, and so on. It's annoying, and my TV doesn't have that many HDMI ports.

Isn't it funny that this is an Apple problem always?