What reaches the user is what is visible on the screen. The user doesn't care about the backend. The user mostly cares about function. And function is helped by good designs and smart, but invisible, technical solutions. A few minutes ago, I stated that the best interface is invisible and simple.
Simplicity takes time.
A modern paradox is that it's simpler to create complex interfaces because it's so complex to simplify them. Information architecture is the challenge of our time. A few years ago, the Swedish company Emmaboda, who make glass products such as windows, published a successful series of ads in the press. I don't remember the exact content of the ads, but the core message was that the best glass products are invisible. You knew that Emmaboda had succeeded when you didn't notice their product, but instead admired the incredible view of the scenery outside the window.