Swatting bugs around a cowpat
Yo gums, #13 Let's swat some 'bugs'
The design concept of MCAS was fine. It met the objectives - as misguided as they appear to be with hindsight.
However, it was the engineering implementation that was flawed, together with weak and failed processes in testing, airworthiness, and certification; all of the holes in the Swiss Cheese lined up - they were already there just waiting for MCAS (it could have been something else).
The system operation which you describe was a failure case, not normal operation.
Yes, in hindsight, MCAS was not an ideal solution, but alternatively if the system has been well engineered, tested, certified, etc, then we would not be having this discussion - MCAS could have been hailed as a neat low-cost fix for an old design pushed too far.
Whilst the rule-makers and regulators fix, patch, kluge, the holes in regulation - swatting bugs around their cowpat, the greater concern is that they might not see the 'cowpat' which they are still standing in; that should 'bug' us.
Hindsight; 'sometimes things go wrong, so that we will know when they go right'.
Aviation assumes that the wrong things will be minor, manageable by limited capability humans, but sometimes those assumptions are wrong.