[pixl97]

>Again: either the mitigation is effective enough for MAX variants, or it’s not

No it is not. Here, you are doing just the normalization of deviance I'm talking about.

An airplane is parts, and an airplane is a system. Just because you use part X in system 1 doesn't mean a mitigation strategy for part X works the same in system 2. For example system 2 (or the MAX 7 in this case) could also have an addition dysfunction in cold weather that by itself is low risk, but when coupled with this procedure now represent a significantly higher risk of loss of aircraft event.

This is the the kind of problem that shows up in new/changed systems when accepting risk from previous systems at their previously measured outcomes.