Originally Posted by
Peter H
c) A stable aircraft may be uncertifiable because of "feel" requirements. It seems possible that MCAS was introduced to address this issue. I cannot remember if B has commented on this.
Which does mean no less than that the stability margin is not large enough to satisfy the certification requirements.
Stressing repeatedly the FEEL term is just the lucent attempt to disguise that it is actually a stability requirment that is violated and give it a harmless spinn.