"
- the manual trim wheels were reduced in size from Classic to NG, making them harder to turn (less mechanical advantage)
- the trimmable horizontal stabiliser size was increased from Classic to NG, but the elevators were not proportionally increased, reducing the relative authority of the elevators; and
- the information about the 'bunt and wind the trim wheel' trim recovery technique disappeared from documentation and training syllabi for the NG
The Classics were properly certificated as safe, by the standards of the day"
from
MAX’s Return Delayed by FAA Reevaluation of 737 Safety Procedures
the questions no one dares consider is just what is the lineage of the Poseidon and what changes have been made to produce it considering the ongoing cf the 737 is turning into..