Wasteful indeed, chevron. Like when NATS started replacing the Astrolite headsets with the Jetlite about twenty years ago. No technical advantage as both headsets used identical components. I wonder how many perfectly serviceable and almost new (and expensive) Astrolites ended up in a skip ??
I hope there is space in a museum, or outside one, for a Watchman and S511 head, when the last one finally stops turning.