Composite Video can only send signals up to 480i. Composite Video can show up to 1080i (or 1080p?). 1080p has at least 10x the video information per second as 480i.
Showing a 480i signal on a TV with 1920x1080 resolution is exactly like taking a little picture you find on the internet, and blowing it up to print on a full page of paper. It's going to look terrible.
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