Why include "Hatches and harnesses" in the pre-landing checks of an aircraft that cannot open a hatch or door in flight, and you never take your harness off??
Almost any aircraft has seatbelts that passengers can take off. I was always taught to check them as part of pre-landing and before take-off.
Hatches is definitely important on the ground. My second area solo I hadn't latched the door properly and it popped open on the way out to the training area. Seeing the ground straight below sure freaked me out!
I do agree with questioning it's necessity pre-landing. At least in all the aircraft I have flown, any hatches that can be open for flight could be open for landing. Anything else shouldn't be touched so shouldn't have changed since you checked it pre-takeoff