The other way around makes sense too, but OG has a strong point. Some ads show you vibrant colors, sharp images and smooth motion. And somehow these advertisements look better as what you’re usually seeing on your screen. They show you what your new TV can do you on your old set up and that is somewhat crazy. It’s like an illusion. Maybe I’m crazy or stupid because I’ve been there and thought wow that new screen can really produce some nice images although I was watching it on my old TV.
The point is that your old TV is perfectly sufficient. Picture quality depends on the source, the age of the show, the cinematography, the art direction, etc… The TV ads just show exaggerated color and entrancing visuals to convince you that you need whatever new technology