Sometimes The Tip of The Iceberg is called MCAS

However, the FAA is now restructuring the 737 Max control surface examining and pursuing the primal causes of the crash which is the first step down Alices' rabbit hole. The FAA is rebuilding the 737 Max step by step with its investigation and Boeing has to stand down and watch with humble inputs to the process. It has taken too long for a  commercial enterprise and it will kill the Max program eventually if the FAA continues not wrapping up its investigation.

Perhaps that is what the FAA has in mind for Boeing; 

kill the737 Max's family until Boeing starts over a new frame with this single-aisle airplane segment. "Whatever" is a Boeing sentiment. Boeing has probably drawn its line in the sand with the FAA and will come out with an all-new 737 Max once the FAA has dithered its investigation long enough.

The only accomplishment will be an FAA face-saving moment when Boeing takes a knee over the issue, thus making a new Max better than a regulatory agency could build. The timeline from March 2019 until entry into Max service will be by 2024. The FAA regains regulatory high ground and Boeing returns to the market place with massive gumption.

Boeing lost two new 737 Max and having 346 of its customers die in two fatal crashes ending with its grounding in March 2019. MCAS systems are to blame because it's the investigative tip that poked up first out of the water.  Since it is an augmented failure it remained the chief cause of the crash.