"I was just curious why people cared about 10-20ms of latency on what I see as "movie on iPad on Plane"" At that latency I can see lips move before I hear audi

"I was just curious why people cared about 10-20ms of latency on what I see as "movie on iPad on Plane"" At that latency I can see lips move before I hear audio. Very disconcerting.