We are approaching the day of automation where aircraft will not have qualified pilots in the cockpit.
We need to put automation CAREFULLY in our designs. Keeping in mind the K.I.S.S. principle on the man-machine interface.
IMHO the current approach (and the trend) is dangerous and require much more from the pilots than before.
The timely "understanding" of certain situations is uncertain and this must orientate us seriously.
The "stuck" THS in this case is an example of the complexity of the issue.