Digital audio may or may not be compressed. Digital audio that is legit purchased most likely has either no compression or loss-less compression or a "set" high quality compression (mp3). And sample rate 44kHz is completely fine since the Nyquist-Shannon sampling principle is satisfied with human hearing range and low pass filtering a sampled signal with the proper sample rate creates a perfect replicated analog signal. I doubt vinyl has the bandwidth to carry a signal past 22kHz anyways. Vinyl may be analog, but it doesn't have infinite bandwidth either.