> Most of the "channel" apps are also very nice, the exception being Amazon's clunky Prime Video app.

To be fair, I've not seen any other platform where Prime Video's interface isn't terrible, and that's including Fire-whatevers. Been that way for years. I guess it's working OK for them, since they don't seem inclined to fix it. In particular, they probably regard making it hard to tell whether something's free-with-Prime or pay-per-view until the moment you choose whether to play it, as a feature.