Watching the hearings are disturbing and makes me think as follows.
first time I was confused as to the feedback loop of accident investigation to regulation were as follows.
One of the recommendations of the Helios accident was a “light” to differentiate between a decompression and a take off config warning. As far as I am aware that recommendation still hasn’t been implemented. The main argument being cost.
the developments of “speed trim” to MCAS and probably many other developments of the 737-100 to the 737 max are being done due to cost.
so who does the maths. Cost of safety?