Facts are another matter. In a car if you wish to slow down you simply lift your foot from the accelerator pedal. There is no question if this should be done slowly and deliberately in order to let the engine revs run down for perceived `good` engine handling.
Tee Emm - Call me pedantic, but I do believe there is a difference in operation between an Otto cycle engine and a Brayton cycle engine.
It's not about worrying about the mechanical parts so much as it is about controlling the high pressures within the engine, and preventing reverse flow under rapid deceleration, and possible flameout.