I see. You’re not using “unstable” in a technical sense. You’re using it as hyperbole. I thought you were saying the 737 MAX was designed with relaxed stability like the F-16 you brought up.
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I'm using unstable as the FAA defines it in Federal Aviation Regulation Airworthiness Criteria Sec. 25.173 — Static longitudinal stability.
The 737 MAX, while more stable than the F-16, is not a stable aircraft as evidenced by the MCAS system Boeing installed.