But I was trying to understand if there was also any technical limitation involved.
I can see your point of view clearly. But what you have seen in the replies is nothing more than personal opinions. 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. Of course not. You simply remove foot pressure. Same with closing the thrust lever for descent or at the flare for landing. I remember my old Boeing instructor from Seattle saying at the flare he wanted a sharp cut and hear the sound of metal hitting metal as the thrust levers hit the stops. None of this slow cut business which only extended float and made no difference to engine handling.