Still very common to see optical out from a tv to a receiver. For audio from the tv's apps to your receiver. My new samsung ks9000 has an optical out port on the connect box that i use.Yet another disappointment to add on the list. Technically, HDMI Audio is superior, but professionals still use the optical out and some home theatres do as well.
So Apple tells tech illiterate people to use iPad Pro, intermediates to use MacBook, and the top 10% and/or hipsters the MacBook Pro. So where do there rest go - the tech literate people, the students, the pro pros? Hello, Windows.
I also used to use the toslink cable way back when i had a white plastic macbook. I would always keep my computer plugged into my tv and used it for a lot of things. Last 5 years not so much. I think apple has surveyed millions of people over the years to see how much they use all these things.