737 Driver, TEM incorporates the whole system, not just pilots being faced with issues. So, in this case one could view MCAS trim runaway as the threat with AOA failures, inadequate training, crew responses etc as errors.
Without going over the apportionment argument again (that’s one for the lawyers), MCAS brought a new TEM ‘flow’ that was not properly thought through. The slightly worrying thing is a similar flow could apply to any trim runaway; in hindsight the number of layers in place may be too few or, more likely, some of the layers have rather large holes.
TEM works, as long as everyone involved recognises the importance their role in the system. Some thousands of posts back I postulated that the overall risk may have been (inadvertently) ‘shuffled’ too far in the direction of the crews.