I think of the aviation automation issue in a very similar way to vehicles. As the automation level increases, you get to the point where the human has been so out of the loop that they can’t be expected to cope when suddenly handed back control. It’s why, IMO, we need to go straight from roughly where we are today to totally autonomous operation and not implement the intervening stages. The seeming push towards LH single-pilot ops is an example of this: if that one pilot happens to be in the toilet when an emergency happens, the aircraft must be able to cope with every conceivable malfunction without assistance. So why is the pilot there in the first place?
If pilots spend most of their time in the cockpit just pressing buttons, it leaves them less able to respond correctly when required.
And the issue is that because of that, the pilots of tomorrow will have much less experience to fall back on, as opposed to those of us who had a decade or two with very limited or no automation, so had to develop the skills needed. There will be much less opportunity to achieve familiarity and competence, such that you could successfully intervene in the event of automation failure, which may be subtle...