Yes it's fascinating for sure, but a "scientifically silent room" is a very different phenomenon from someone watching a TV show on a TV not producing fake silence in their living room, where there is already noise and reverberation.

You can turn the volume down already if you want to experience the non-phenomen of not having a TV produce noise. It will not upset you, I promise.

The reason why people get disoriented in silent rooms is the lack of response from reverb and/or lack of sensory input at all.

Addition of ambient noise to an audio signal is for other reasons. With proper mixing and envelope control you will not experience cutting in and out of silence. However, audio production is a lot more complicated than just cutting audio together. It makes sense to create or simulate an entire "enviroment" at which to throw audio at, sort of like priming a canvas before painting.