747Focal:
Why would I want to turn off the ADPs? I don't selectively turn off any other backup systems! They backup the EDPs for the center autopilot, normal braking, autobrakes, antiskid, and nosewheel steering on approach and landing. With the engine at idle, the EDP alone is insufficient to maintain full pressure under even moderate hydraulic load.
Also, in the event of go-around, landing gear and flap retraction may be compromised, becoming a safety risk.