also they increased the maximum stabilizer angles mcas could command, the review/certification was done with a 0.6 cap (effective but not overwhelming) and on production it was increased on a whopping 2.5 degrees.

it was also meant to be using vertical acceleration to understand whether the plane was actually stalling, but that trigger was removed

it was also supposed to operate slowly enough to let people catch up with its operation and be able to disconnect it in case of a runaway trim, but the increased angle required to move the stabilizer faster

I don't know the exact English term for this kind of iterative failure of people communicating changes to each other assuming they are both fixing a problem, instead making it worse, but it's not just like they were doing half measures, they were each tuning their systems in silos, without considering cross system functionality from each system behavioral changes