I have never understood that, just what did you expect? reduced sound quality? Sounding like low bitrate mp3's? It is digital after all. Ok, maybe a bit more jitter, maybe pulse streaching due to cheap plastic fiber. But in terms of what fiber is used for everywhere else the data rate is very low.
And it has the advantage of galvanic isolation.
Especially with TV, hardly 192/24
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.