So, Boeing can't assume that flight crews are adequately trained? Would that be just in the memory items for runaway trim, or would that also include the other specifics of the type, as well as basic airmanship?
These accidents suggest that these situations were at the limit, or beyond of what can be trained - to ensure reliable action. Thus the inability to react indicates aspects beyond any reasonable expectation of human performance.
The drills start with the need to recognise the situation - time, misdiagnosis, diagnosis, mis-action.
Where is the big red light which indicates ‘trim runaway’; if the aircraft system were able to recognise this then why not disengage trim automatically.
The basis problem is that a weak design relies on human judgement and intervention, in a critically limited time frame, which if not achieved presents a physically impossible task.
Unacceptable !
There is a limit to what can be trained, or be relied on for consistent recall in time for action. Failure to recognise that, manufacturer, regulator, or operator, is just as serious as the design issues.
The human issues are fundamental elements of aviation safety.
In these circumstances the system must be changed so that all operations are within the limited human capability.