Yeah the functionality is definitely important from story telling perspective, my point there is the style of the UI is also part of the world building, e.g. the screens from Star Wars should look different from the screens from Blade Runner cuz they're different worlds and different culture, people should have different means to access information from devices. Making everything typical sci-fi style hologram looking UI works but it's a place that can add some nice touch (or can use non screen interfaces if it makes sense in the world)