Simply because in digital media, you pretty much always need to prepare your golden master with material better than the reproduction equipment. The reproducti

Simply because in digital media, you pretty much always need to prepare your golden master with material better than the reproduction equipment. The reproduction equipment has no need to support 240fps, 36bit color, 12k resolutions... that would be a total waste of money on hardware. But when editing the media, the extra quality is useful. Audio does the same thing. Most music is 44.1kHz sample rate, sometimes 48kHz. Studios might record in 96kHz or more; the human ear can't appreciate 96kHz and most hardware can't play it, but when the mix it, the result has fewer distortion/artifacts.