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.
Rather sure he was trying to make a point across,that reducing the thrust too slowly will increase flare and also higher risk of bounce landing.
However since the thrust lever angle being already low entering the flare area,a standard continuous reduction in thrust or an abrupt will achieve the same.
No need of slamming banging i think.