Lots of companies can make decent apps. And IMO the Prime Video TV/Mobile and Amazon mobile apps are "decent" from a "they do what they're trying to do" standpoint and don't fail all the time.

But they don't really think about things from a "consumer who wants to watch something tonight" vs "shopper who we want to get money from" perspective. So the Prime Video app has been painful to navigate and use. Things like concepts of how people want to interact with TV shows - one top level entry with seasons in it, vs top-level entries per season, which took them forever to change - reflect quick and dirty shoveling of concepts over from how they'd sell box sets or such vs thinking about it from a user-first POV. Or how search will return a match for just about anything because they will happily sell it to you vs having as a default "show any free results first because I'm not looking to spend more right now."

That's a product/vision failure (or just mismatch with what you and I want) not an engineering/engineering culture thing.