JB - you're kidding right? I'm not even sure you're worthy of a reply, but I'll fire one at you anyway.
My comment meant, that over the course of a decent from FL410 to 0 you could easily achieve an average of 2300' per min ROD, even flying economy speeds.
You clearly don't fly. It is not OK to fly idle decent approaches (until adding power once in full landing config as I previously said).... ITS IDEAL!!!
Why does an aircraft work out a top of decent automatically for you? Why is this point where it is? I'll let you think about it.
I say again- back to topic....please!