Well from my recollection: The TFO mk1 model created a significant number of TFO's who became, to quote GL, 'Super S/O's'. Brilliant on Y1 and Transpac!
More than a few hiccupped when confronted with Command Course, so it was seen as doing them a disservice; an unintended consequence and the situation dissolved... or as Dan put it 'withered on the vine'...