I don't think the air-frame for the 737 MAX is broken, though.

I definitely agree that the MCAS system should have required two AOA sensors, and been automatically disabled when there was a disagree. I agree that Boeing should have briefed airlines and pilots about the MCAS system, the AOA disagree indicator, and potentially required new training.

That's the gist of this issue.

This is not an airframe issue. It has never been an airframe issue.