Dozy
The THS position would have been a moot point if the PF hadn't made significantly inappropriate pitch inputs for that phase of flight.
The main thing is how to achieve that a pilot does not make an inappropriate action in certain phases of flight
The only solution other than use his brain is physically preventing a way to do this action (as is sometimes done in the industry in general .. restricted movement of limbs or safety guards .. barriers) which is virtually impossible in aviation
On the other hand one can also ask the onboard artificial intelligence to play the role of safety guard
For example .. why embedded intelligence leaves THS do what he wants (following a bad pilot action) that is to say foster the rise ... while she know that the airplane is near its maximum allowable alltitude (from some parameters ... weight .. engine power altimeter .. air temperature .. etc. ..) and when that maximum height is reached ... she keeps in position THS to continue climb