“Override” pilot input? Had aircrew been aware of the procedure, no, the very existence of the stability system was not known. Sole source is unfortunate, but merely a poorly designed system that can be overridden, if recognized.
It did not “override”, it was in competition with, but did not “cancel” pilot input. It was “unnoticed”. hence “unchallenged”.
A less than robust system might have escaped causing the company its black eye; surely the Trim would have been selected out, and we wouldn’t be having this discussion?
These are two distinct issues. Poor design made its way onto a self regulated flight deck. Keeping it from aircrews is inexcusable. If not, then blatantly stupid.
imo