Their awful UI is an artifact of trying to be a storefront (where shows are sold by the season) and a streaming service (where you can binge without regard for seasons).
This might depend on the device, I'm using the Fire stick and I think it bundles the seasons under one show.
I'm not praising that app at all btw, that's just why I think the award for worst app goes to CBC gem on the Fire stick. It shows you which episodes you watched. Past tense. To watch the next one you have to search for the show again and navigate to the episode. Why on earth would anyone want that?!
I found myself going to Netflix by default because its UI is so much smoother in every platform. Amazon does have things I want to see, but I don't want to put up with the slowness and jank.
Ugh, so bad. I pay for Prime in the US and UK, but the app gives me no way to switch countries like I can with the store. When I’m in the UK, I expect it to show me the local UK library that I get with my Amazon UK prime account. Instead, the app assumes I’m “traveling” and forces me into a reduced version of the US library. Worse, it renders all the thumbnails in the catalog view, while only telling me content is unavailable after I’ve decided to watch it and click play.
For this reason I only watch Amazon originals on Prime, since I know they’ll be available.