The state of our technological advancement is a very relative thing. Our current technology is not at all clumsy compared to previous times. Science fiction movies portray holographic screens and suchlike because by definition they are always a step or two ahead and portray the filmmakers’ imagination of what future technology could be like.
In perhaps another few years holographic screens might be a reality, and the science fiction movies of the time would portray some even more advanced idea that we can’t even imagine yet (perhaps direct thought control of matter via some kind of exotic waves), and the OP would be asking why our technology has “only” managed to come up with “clumsy” holographic screens!