Even what is considered “full frame” today is ridiculously small from a historical point of view, when 8x10 plates were common (that’s 60x the surface area!) and not even the largest format in use.
Cell phone photography has made us used to imaging surface areas that are not even a centimeter on each side - it’s a miracle of engineering we can get decent pictures out of those constraints, but image quality is as low as it gets, even though the marketing tells us those are the most advanced cameras ever.