I reckon the pilots should routinely disable it, even when Boeing say there is a new version of it working well. I wouldn't trust anything that is possibly going to trim my aircraft into a maximum dive configuration that I cannot correct with the elevators and that I need to use two hands to turn the trim wheels back to somewhere near normal. The trim is supposed to be a column force relief, not a complete override to column authority.
Incredible stuff Boeing. How did they come up with that?