Every landing is different and you may or not carry power to touchdown,
or you may cut power while still on the downwind leg. Sometimes you
have to add power after you have touched down like with some planes on
skis. The snow slows you down so fast you have to add power to get a
strong airflow over the elevator to keep it down instead of nosing
over.
A carrier landing is done with full takeoff power in case of a "bolter"
or missed wire and you have to take off immediately. When the pilot
feels the sudden deceleration from a confirmed wire, he/she chops the
power and the rest of the landing process proceeds.