Noun: medium (media,mediums) meedeeum
Good lord. I'm going to use an example that I think you can understand.
Consider a show, created to be shown in HD, about the art of painting Because this show was created for HD, it shows very detailed images of the brush strokes. The HD film work is a part of the content. It becomes a different show if it is in SD.
The visuals of a TV show are a part of the content of that show. When you change the visuals, you change the content. If you can't understand the importance of the visuals to the content, and that HD is not the same as SD, you are in the wrong forum.