Much more complete explanation of dihedral stability than any I'd received to date.

Aerodynamics sounded really simple when I was in ground school. And then when I started talking to people who practiced it for a living, I realized there was much more depth to it. Everything affects everything else. My first day on the job was a day-long seminar on supersonic airfoil flutter modes. I just sat there thinking, "Oh, crap, I'm in over my head."

As you can imagine, the Wright flyer had very poor lateral stability (no fuselage). And so the Wrights built it with anhedral wings. We tend to think of the Wrights as some bicycle makers who got lucky. On the contrary they knew a lot about what they were doing.

And, apologies for an unnecessary addition to your point.

Not at all. In truth I haven't flown an Arrow in years, so I could be remembering its handling characteristics wrong. In any case it's not hard to find other examples of passive aerodynamic stability.