We are spoiled by modern filming technology.
When I was a kid, and long before, many scenes of many movies were filmed in a studio. A huge warehouse, with a street, and fronts of buildings, and cowboys shooting it out, while the desert or mountains in the background were painted on the wall.
I am no more critical of earlier movie production, that I am of Model T's being lame compared to a Toyota.
This progression of technology is history, and should be celebrated, not criticized.
I also see, more than ever, obvious props on old TV shows and movies. And I even call them out. But I do so just to show how far we've come.
Movie sets were art forms of their own. Even when we see an obviously painted background, it's not always easy to see where the props end, and the painted wall begins.