I think there’s an interesting idea in here - not necessarily that ‘everyone should use dithering’, but more that if you are using an image and if that image is

I think there’s an interesting idea in here - not necessarily that ‘everyone should use dithering’, but more that if you are using an image and if that image is being used in a way that would not be harmed by stylizing the image in some way, that one of the things you can consider when thinking about how to stylize it might be the compressibility of the stylized image. If you are coming up with a look for a site, dithering all the hero images, or running them through a cell-animation filter, or mosaicing them, or halftoning them, all are stylistic choices that might help your design stand out, and help reduce file size. But… no, you probably shouldn’t just diffusion dither everything down to black and white.