It is analog signal connector from 19th century. Analog signal, well, has an analog quality, just think of usual S D television.
With lightning, you can have digital signal and better quality, or HD. There is higher density signal or Hi-Res signal which has higher sampling rate than CDs, 24bit/96kHz or even 192kHz.
Are your ears digital or analogue? Comparing with TV is rather stupid; sound has much lower information density, and the analogue signal is transmitted over a meter or two of copper cable, not over hundreds or thousands of miles of unprotected airspace.