RT video/audio failing never results in death. Where as failures in "avionics, industrial control" absolutely can / do. That seems to be where OC was drawing the line.
Seems to be a common distinction, although GP is right with the addition that the production side of things is more demanding (and at least would suffer financial damage if problems occur to often) than the playback side formed by random consumer gear, and has some, especially low-level/synchronization-related, gear to hard standards. But often soft is enough, as long as it's reliable enough on average.