With the NG now getting dragged in on the manual trim issue,
PR is a very big requirement.
Imagine if China grounds the NG due to the change of tail plane area and reduced trim wheel and the deficiencies of the simulator characteristics (under simulated), then a few other regulators in "third world" under trained pilots countries also following China (Asia and Africa).
PR is a big issue not just for Boeing but equally so for the FAA (remember FAA act on data before grounding). The NG fails the data test on a "under" realistic simulator - so where is the FAA?