RAT 5
Keeping a hand on thrust lever is a habit for moving throttles. In AB FBW it doesn't make sense since it gives you no clue as to what's happening. you watch the actual thrust. This can make pilots believe that it is never required. So they need to be told that at least during an approach you need to keep your hand on the thrust lever not because it gives any clue on approach but to switch to manual thrust if required without grabbing something else in a hurry. Approach starts a long way up so SOP defines a limit. The habit of disregarding SOPs is not necessarily a sign of superior piloting skill. Many do it out of ignorance also. In FBW, armed with only FCOM/FCTM you are not in a position to change or device your own procedures. Some airlines have almost come to grief doing that. You need to keep the manufacturer in the loop because behind the SOP software/hardware and design characteristics are involved. In FBW it may not be what it appears.