This is helpful! What I always found odd: For many years, mobile users had @2x displays and desktop users @1x. If you just decorate an article that as roughly

This is helpful! What I always found odd: For many years, mobile users had @2x displays and desktop users @1x. If you just decorate an article that as roughly a width of 800px, a crisp article image was bigger in file size for mobile users (@2x) vs. desktop users. So assuming that mobile users had lower bandwidth, you could simply serve the same picture for both users. Many articles on image optimization seem to assume that desktop = bigger dimensions.