Because content was made with the available technology in mind. For example, [old video game art](https://www.reddit.com/r/FinalFantasyVII/comments/q3yp85/left_side_is_what_it_looked_like_on_a_crt_tv_no/) looked way better on old CRT screens than they do on modern ones.
Conversely, modern content is made with the assumption that modern screens can show more detail.
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