Main problem was that flow to the reaction controls became ineffective below 20 noz, so all of a sudden there was no way of keeping the jet pointing upwards! Hence the requirement to carefully nudge the nozzles to 20. Engine cut-backs were easy to deal with by tripping the limiters - to hell with the counts!
This pic was used in a flight safety course where the question was “what is wrong with this picture?”. All the bona jet guys came out with all the good guff - but the staff answer was that the pilot should have been in the cockpit!
Mog