Downwind checks really take no time to do once you are used to them. What, 4 seconds? Final checks take no time to do. Why not wrote them in?
Extract from linked CASA ATO Manual:
Checklists should be kept as short as practical to limit diversion of attention or “head down” while carrying out the checklist
• The addition of unnecessary items could be a distraction and should be removed
• Items on a checklist not required for a specific aircraft should be removed or clearly identified to alert crew the equipment is not fitted.
Seems clear enough to me. Centaurus has a point.