The best quality IS the quality the filmmaker wanted when it was created.

People buy CRT TVs even now btw, the absence of input lag makes it ideal for competitive smash bros.

Most people are perfectly happy watching an old film/show on a new screen because it can near as dammit replicate exactly what the director wanted us to see. Adding actual stuff to the framing of shots is a nuts idea and it absolutely changes the quality.

To give an example, having someone’s face fill the screen versus being centred with more background visible around it changes the feel of the shot a LOT. 12 angry men is a good example here because the camera gets almost imperceptibly closer to the person speaking throughout the film to ramp up tension and draw the viewer into the story. It creates a feeling of claustrophobia that would be dulled if you added content to the edges of the screen.