While the ace of the base is flying manually, who do you suppose makes all the mode settings for the FD, continuously sets the HDG bug, sets the airspeed bug for every speed change, resets and confirms the altitude selector setting, makes the FMC entries, does the RT, runs the checklists, selects gear and flap, monitors the pressurisation system, addresses master caution alerts, monitors the position and altitude of the aircraft with reference to the departure/arrival, monitors terrain, monitors proximate traffic, talks to the cabin crew and if necessary runs the QRH?
Drama alert! Sounds impressive but most of those don't happen at the same time. Monitors the pressuriation system? Ya joking? Runs the QRH whilst Ace does his handflying practice? Ya joking on that too? Handflying PF confirms Alt Sel setting...