The difference is that with digital signal there is limited number of components that actually make a difference and as soon as a certain level of quality is re

The difference is that with digital signal there is limited number of components that actually make a difference and as soon as a certain level of quality is reached (basically reliable transmission) nothing can be improved further. For listening purposes the transmitted data can be buffered on the receiver DAC. This means that as long as the buffer on DAC is not emptied everything else may be failing badly and it will have zero effect on your listening experience.