The Dutch roll example is actually very similar from a regulatory standpoint, except that it concerns dynamic instead of static stability. FAR 25.181 requires

The Dutch roll example is actually very similar from a regulatory standpoint, except that it concerns dynamic instead of static stability. FAR 25.181 requires positive damping, i.e. if you let go of the controls, the Dutch roll has to diminish on its own. There has never been been an accident due to the airframe's pitch instability and MCAS not accomplishing its intended function. Both of the accidents happened because the MCAS system itself failed and activated when it shouldn't have. If they had made a reliable MCAS (by which I mean the whole system from sensors to controls to actuation and pilot interface), there would have been no problem.