I was of mixed emotions about the show. Yes, I agree that the "silence" was a powerful part of the show's emotional impact, but I am/was not all that much of a fan of the music.
Artistically, I believe that true silence (that is, not even background noise) would have had a greater impact. On the other hand, being so silent for 30 minutes would very likely have caused alarm amongst viewers ("What's wrong with the sound on my tv?"), thus detracting from the overall experience!
Still, as always, a highly unusual show well worth watching!
SWR