I haven't studied NFTs but I will admit I had an misconceptions that the low pixel art NFTs purpose was that it was able to be stored on the chain itself as "it

I haven't studied NFTs but I will admit I had an misconceptions that the low pixel art NFTs purpose was that it was able to be stored on the chain itself as "it's own thing" or as a representation of a "bigger piece". My question would then be.... why the lowres pixelated NFTs if they are being hosted somewhere else?