In Command
To look at this another way.
Awake or asleep, in the seat or on the toilet. When you are pilot in command the command part (responsibility) does not take a break until you are parked at the other end and stepping off of the aircraft.
Experience is not just about manipulation. It is exposure to risk and the management of said risks. Like any leader, be it the general of an army, a ships captain or the president/prime minister, the job does not stop if you are catching a nap whilst either in office or on a military campaign. Delegating roles and responsibilities is part of being in command. The buck will stop with said commander.
You cannot buy or train experience. It is gathered slowly over many years of exposure to risk.
The automation of aircraft does not address or replace the flexibility of the human influence on achieving safer outcomes when automation reaches the limit of its design.
This is a long winded way of pointing out the systemic shortage in experience levels and the limitations inherent in machines.