I think there will be zero doubt that the trim wheel will be tested by numerous regulators under the flight envelope conditions, if not by the FAA.
The results should the FAA certify the MAX first - would "can" the FAA as a credible regulator.
They already have trust issues, and just days ago seem to be caught lying or covering up events during initial certification.
It still seems neither the FAA or Boeing understand the gravity of the problems and still cling to "the best safety record" in a decade, to shield from the worst decade ever of a new model in a modern era of safe air transport.
The accountable persons need to step forward and or named - but that needs to be deferred
till the last court case.