In the case of the landing checklist to which you refer, my understanding of the 'DO' is that PNF reads and 'DOES' the CHECK as opposed to the 'normal' where PNF reads and PF 'DOES' the CHECK?
It is a 'CHECKLIST'! As E120 says, the items are (should be!) done already. I cannot see the issue, I'm afraid.
For the other parts of the NN checklists, PNF 'declares' the item and PF nods, grunts (or waves whatever is spare at the time) as an acknowledgement
