No manual for any light aircraft I've flown (some 40 types from C150s to C90 Kingairs) advises leaving a trickle of power on. They all - including arrows & Tobagos as I recall - specify flying through the screen height in a glide as the book technique to achieve the landing chart distances. Apart from that consideration there are numerous variations on the theme to try to land a greaser.
Depending on turbulence & windshear, headwind/tailwind component, configuration, temp. & weight then reducing power earlier, later &/or at a different rate to achieve an aiming point can make difference to landing point & smoothness.
When I was flying in Shetland into 380m strips in gale force winds with strong shear & turbulance I would use full to idle power and anywhere in between as often as necessary to consistantly achieve a touchdown in the same 10 m area but always getting the power off as fast as possible once the wheel were on. Now that I'm flying in the US into mostly 4000' to 9000' runways then will usually trickle the power off during the flare to give a smooth touchdown, often touching down with some small amount of power still on & needing to be soon after.
Is it IAW with the landing chart's specified technique? Of course not. But one instance was in rather extreme conditions, and the other has more runway that the chart considers. But if I have to operate into a limiting strip then my technique closely mirrors the book - albeit with some judgement developed through experience about rates of throttle closure & exactly when.