I’m currently paying for both HBO and Netflix, and use both services regularly. And the difference between the two products’ design and user experience is astonishing. The former lacks just about everything one would come to expect from a streaming service in 2016: recently played shows, history of watched episodes, related/recommended shows etc. From a UX/UI perspective, it sucks.
That said, there is no way I would ever prefer a Netflix show over an HBO show because of this.
Sometimes when I hear people talk about the importance of UX/UI, they refer to it as the holy grail of products. But of course it is not. It can be a key differentiator and a competitive advantage, but it will always only add instrumental value to the product. Unless the product has underlying, intrinsic value – it’s worthless.