I don't think that is the case, Brian. It's just that the FTSs used to be a fantastic source of QFIs for the OCUs and Front Line Sqns. QFIs that had a good background in instruction.
Now, the other side of the coin - you know I can only talk about mil FJ training. When moving to the F-15, I did a 3 month TX (short conversion course) followed by a 3 month instructor upgrade after which I taught ab initio students everything from trip one in the jet to AAR to combat to IF to... You get the idea. And I am not, nor ever have been, a QFI. The system seems to work. The snag for the RAF is that CFS still insists that only QFIs can do certain sorties, but there is no longer the capacity to produce them. So therein lies the problem; a system that requires something that the system can no longer produce in sufficient numbers.