I mean, you can "buy" stuff in Amazon Prime Video off service. Unlike Netflix or other platforms, they will let you "buy or rent" streaming movies, which is the same as finding the movie on the Amazon storefront and buying the digital copy instead of a physical copy.
Now, does that mean they won't yank it? Not really. A digital license is a license, not a purchase. Is the word "buy" or "own" inaccurate? I'm hoping not, because like the Sony thing showed, platforms are desperate to not have the courts improvise what rights they owe the buyers on digital purchases.
I'm still buying my movies in 4K BluRay, though. And working on ripping all of them for streaming at home, now that I finally have the space.
They still have the Xperia I and V series, which is taller but not necessarily much wider. I have one. I like it.