Bandwidth limitation on spdif, but everyone listens to everything via Bluetooth these days. In a world where people will spend over $100 on AirPods I don’t expect we’re going to get meaningful improvement in audio anytime soon. Audio manufacturers are as much to blame as anything, annual releases of marginal improvments and ever increasing prices. Heck you can spend 4 figures on a bloody sound bar. Convenient yes, audio reflective of cost, hells no.