No mention in this thread of hard/grass/short/long.
What difference does that make to the standard procedure of flying a stable approach at the appropriate approach speed to cross the threshold at a safe height on the way to the aiming point?
More to the point, what difference does it make to the correct technique for landing i.e. 50ft to touchdown?
If the performance figures say the runway is long enough then that is OK. If having applied the appropriate factor(s) for grass or wet or tailwind or downslope and the runway length is still sufficient then that is also OK.
However, Tigger_Too quite correctly points out - if the POH gives you a speed to fly then that is the speed to fly and it follows that if the same POH provides figures that show the grass strip you want to fly into is too short then trying to fly in there by shaving 10Kt off the certified approach speed and praying that dragging it in across the road does not cause a collision with a tractor is making a bad situation worse.