Compelling argument for what? It is not impossible to recreate by eyesight, it requires more time. To accomplish this level of realism geometrically, you creat

Compelling argument for what? It is not impossible to recreate by eyesight, it requires more time. To accomplish this level of realism geometrically, you create a perfect perspective grid and place what you see in it. To accomplish this level of tonal representation you patiently compare the values from the scene with values from your palette/canvas. It is classical painting craftsmanship, lost in the collective mind in post-modernistic world without need of art culture and knowledge. Using an optical device gives more time to concentrate on composition,execution and emotional message, that is the real point that becomes clear in the end of the movie.