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Nice summary of the comments from that post, unfortunately zero people there actually know what differences or mitigations are in place for the 8 & 9 that aren’t relevant for the 7 & 10.

Given Boeings absolutely atrocious safety record with the Max, I’m not similarly inclined to believe a bunch of speculation about regulators being dumb

This is true, though one could argue the exemption shouldn't have been granted to 8 and 9 in the first place.

It might be related to the crash of two MAX-8 (albeit not American ones), after the same exemption was given to it. It would be understandable that the FAA would be more cautious.